Gc policy read update

[hoangpham95]

Currently when GCPolicy remote resource is updated not on TF (Pantheon, gcloud CLI, etc.), the gc_rules string are not updated on read. This PR is fixing that issue.

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

• [ ] 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).
• [ ] Generated Terraform, and ran make test and make lint to ensure it passes unit and linter tests.
• [ ] 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).
• [ ] Ran relevant acceptance tests (If the acceptance tests do not yet pass or you are unable to run them, please let your reviewer know).
• [ ] Read the Release Notes Guide before writing my release note below.

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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 ( 3 files changed, 46 insertions(+), 2 deletions(-)) Terraform Beta: Diff ( 3 files changed, 46 insertions(+), 2 deletions(-)) TF Validator: Diff ( 2 files changed, 60 insertions(+), 43 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

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Please only use the types listed in https://github.com/GoogleCloudPlatform/magic-modules/blob/master/.ci/RELEASE_NOTES_GUIDE.md.

[modular-magician]

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

Diff report:

Terraform GA: Diff ( 2 files changed, 141 insertions(+)) Terraform Beta: Diff ( 2 files changed, 141 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

[kevinsi4508]

This PR is not ready. @hoangpham95 , could you set it to draft mode? Thanks!

[kevinsi4508]

To be replaced be https://github.com/GoogleCloudPlatform/magic-modules/pull/6526.