Add support for GitHubEnterpriseConfig

[prateek2408]

Currently CloudBuild does not support GitHubEnterpriseConfig. This PR adds the support of creating GitHubEnterpriseConfig resources.

fixes {https://github.com/hashicorp/terraform-provider-google/issues/9956}

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)

cloudbuild: added support for `"GitHubEnterpriseConfig"` in `google_cloudbuild_trigger`

[modular-magician]

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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, 799 insertions(+), 2 deletions(-)) Terraform Beta: Diff ( 4 files changed, 799 insertions(+), 2 deletions(-)) TF Validator: Diff ( 3 files changed, 188 insertions(+), 3 deletions(-))

[modular-magician]

Tests analytics

Total tests: 2174 Passed tests 1934 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

[rileykarson]

I suspect this PR is stale, so closing- we do have trigger-level support as of https://github.com/GoogleCloudPlatform/magic-modules/pull/6963