compute_snapshot datasource added

[AarshDhokai]

fixes https://github.com/hashicorp/terraform-provider-google/issues/3382

If this PR is for Terraform, I acknowledge that I have:

• [x] Searched through the issue tracker for an open issue that this either resolves or contributes to, commented on it to claim it, and written "fixes {url}" or "part of {url}" in this PR description. If there were no relevant open issues, I opened one and commented that I would like to work on it (not necessary for very small changes).
• [x] Generated Terraform, and ran make test and make lint to ensure it passes unit and linter tests.
• [x] Ensured that all new fields I added that can be set by a user appear in at least one example (for generated resources) or third_party test (for handwritten resources or update tests).
• [x] Ran relevant acceptance tests (If the acceptance tests do not yet pass or you are unable to run them, please let your reviewer know).
• [x] Read the Release Notes Guide before writing my release note below.

Release Note Template for Downstream PRs (will be copied)

`google_compute_snapshot'

[modular-magician]

Hello! I am a robot who works on Magic Modules PRs.

I've detected that you're a community contributor. @rileykarson, a repository maintainer, has been assigned to assist you and help review your changes.

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[modular-magician]

Hi! I'm the modular magician. Your PR generated some diffs in downstreams - here they are.

Diff report:

Terraform GA: Diff ( 4 files changed, 445 insertions(+)) Terraform Beta: Diff ( 4 files changed, 445 insertions(+)) TF Validator: Diff ( 2 files changed, 3 insertions(+), 3 deletions(-))

[modular-magician]

Tests analytics

Total tests: 0 Passed tests 0 Skipped tests: 0 Failed tests: 0

Errors occurred during REPLAYING mode. Please fix them to complete your PR View the build log

[modular-magician]

Hi! I'm the modular magician. Your PR generated some diffs in downstreams - here they are.

Diff report:

Terraform GA: Diff ( 4 files changed, 443 insertions(+)) Terraform Beta: Diff ( 4 files changed, 443 insertions(+)) TF Validator: Diff ( 2 files changed, 3 insertions(+), 3 deletions(-))

[modular-magician]

Tests analytics

Total tests: 0 Passed tests 0 Skipped tests: 0 Failed tests: 0

Errors occurred during REPLAYING mode. Please fix them to complete your PR View the build log

[modular-magician]

Hi! I'm the modular magician. Your PR generated some diffs in downstreams - here they are.

Diff report:

Terraform GA: Diff ( 4 files changed, 442 insertions(+)) Terraform Beta: Diff ( 4 files changed, 442 insertions(+)) TF Validator: Diff ( 2 files changed, 3 insertions(+), 3 deletions(-))

[modular-magician]

Tests analytics

Total tests: 0 Passed tests 0 Skipped tests: 0 Failed tests: 0

Errors occurred during REPLAYING mode. Please fix them to complete your PR View the build log

[modular-magician]

Hi! I'm the modular magician. Your PR generated some diffs in downstreams - here they are.

Diff report:

Terraform GA: Diff ( 4 files changed, 442 insertions(+)) Terraform Beta: Diff ( 4 files changed, 442 insertions(+)) TF Validator: Diff ( 2 files changed, 3 insertions(+), 3 deletions(-))

[modular-magician]

Tests analytics

Total tests: 0 Passed tests 0 Skipped tests: 0 Failed tests: 0

Errors occurred during REPLAYING mode. Please fix them to complete your PR View the build log

[modular-magician]

Hi! I'm the modular magician. Your PR generated some diffs in downstreams - here they are.

Diff report:

Terraform GA: Diff ( 4 files changed, 442 insertions(+)) Terraform Beta: Diff ( 4 files changed, 442 insertions(+)) TF Validator: Diff ( 2 files changed, 3 insertions(+), 3 deletions(-))

[modular-magician]

Tests analytics

Total tests: 2174 Passed tests 1930 Skipped tests: 238 Failed tests: 6

Action taken

Triggering VCR tests in RECORDING mode for the tests that failed during VCR. Click here to see the failed tests

TestAccFirebaserulesRelease_BasicRelease|TestAccSnapshotDatasource_filter_mostRecent|TestAccSnapshotDatasource_filter|TestAccSnapshotDatasource_name|TestAccComputeInstance_soleTenantNodeAffinities|TestAccCGCSnippet_eventarcWorkflowsExample

[modular-magician]

Tests passed during RECORDING mode: TestAccFirebaserulesRelease_BasicRelease[Debug log] TestAccSnapshotDatasource_filter_mostRecent[Debug log] TestAccSnapshotDatasource_filter[Debug log] TestAccSnapshotDatasource_name[Debug log]

Tests failed during RECORDING mode: TestAccComputeInstance_soleTenantNodeAffinities[Error message] [Debug log] TestAccCGCSnippet_eventarcWorkflowsExample[Error message] [Debug log]

Please fix these to complete your PR View the build log or the debug log for each test

[AarshDhokai]

What issue(s) does this PR address? The filter and most_recent behaviour are not standard for a single-resource datasource, so I want to make sure we're not introducing additional complexity / surface we have to maintain without a justification.

This PR addresses this issue - Disk snapshot data source #3382 .

[rileykarson]

Thanks! The issue clarifies why we'd want those behaviours.

[modular-magician]

Hi! I'm the modular magician. Your PR generated some diffs in downstreams - here they are.

Diff report:

Terraform GA: Diff ( 4 files changed, 370 insertions(+)) Terraform Beta: Diff ( 4 files changed, 370 insertions(+)) TF Validator: Diff ( 2 files changed, 3 insertions(+), 3 deletions(-))

[modular-magician]

Tests analytics

Total tests: 2177 Passed tests 1935 Skipped tests: 238 Failed tests: 4

Action taken

Triggering VCR tests in RECORDING mode for the tests that failed during VCR. Click here to see the failed tests

TestAccComputeInstance_soleTenantNodeAffinities|TestAccCGCSnippet_eventarcWorkflowsExample|TestAccSnapshotDatasource_filter_mostRecent|TestAccSnapshotDatasource_filter

[modular-magician]

Tests passed during RECORDING mode: TestAccSnapshotDatasource_filter_mostRecent[Debug log] TestAccSnapshotDatasource_filter[Debug log]

Tests failed during RECORDING mode: TestAccComputeInstance_soleTenantNodeAffinities[Error message] [Debug log] TestAccCGCSnippet_eventarcWorkflowsExample[Error message] [Debug log]

Please fix these to complete your PR View the build log or the debug log for each test

[modular-magician]

Hi! I'm the modular magician. Your PR generated some diffs in downstreams - here they are.

Diff report:

Terraform GA: Diff ( 4 files changed, 369 insertions(+)) Terraform Beta: Diff ( 4 files changed, 369 insertions(+)) TF Validator: Diff ( 2 files changed, 3 insertions(+), 3 deletions(-))

[modular-magician]

Tests analytics

Total tests: 2179 Passed tests 1935 Skipped tests: 238 Failed tests: 6

Action taken

Triggering VCR tests in RECORDING mode for the tests that failed during VCR. Click here to see the failed tests

TestAccBigtableAppProfile_bigtableAppProfileMulticlusterExample|TestAccBigtableAppProfile_bigtableAppProfileSingleclusterExample|TestAccBigtableAppProfile_bigtableAppProfileAnyclusterExample|TestAccComputeInstance_soleTenantNodeAffinities|TestAccCGCSnippet_eventarcWorkflowsExample|TestAccSnapshotDatasource_filterMostRecent

[modular-magician]

Tests passed during RECORDING mode: TestAccBigtableAppProfile_bigtableAppProfileMulticlusterExample[Debug log] TestAccBigtableAppProfile_bigtableAppProfileSingleclusterExample[Debug log] TestAccBigtableAppProfile_bigtableAppProfileAnyclusterExample[Debug log] TestAccSnapshotDatasource_filterMostRecent[Debug log]

Tests failed during RECORDING mode: TestAccComputeInstance_soleTenantNodeAffinities[Error message] [Debug log] TestAccCGCSnippet_eventarcWorkflowsExample[Error message] [Debug log]

Please fix these to complete your PR View the build log or the debug log for each test

[modular-magician]

Hi! I'm the modular magician. Your PR generated some diffs in downstreams - here they are.

Diff report:

Terraform GA: Diff ( 4 files changed, 369 insertions(+)) Terraform Beta: Diff ( 4 files changed, 369 insertions(+)) TF Validator: Diff ( 2 files changed, 3 insertions(+), 3 deletions(-))

[modular-magician]

Tests analytics

Total tests: 2181 Passed tests 1941 Skipped tests: 238 Failed tests: 2

Action taken

Triggering VCR tests in RECORDING mode for the tests that failed during VCR. Click here to see the failed tests

TestAccFirebaserulesRelease_BasicRelease|TestAccComputeInstance_soleTenantNodeAffinities

[modular-magician]

Tests passed during RECORDING mode: TestAccFirebaserulesRelease_BasicRelease[Debug log]

Tests failed during RECORDING mode: TestAccComputeInstance_soleTenantNodeAffinities[Error message] [Debug log]

Please fix these to complete your PR View the build log or the debug log for each test

[AarshDhokai]

Hi @rileykarson, Could you please Merge this PR as it's approved?