Add example and test to showcase count increase/decrease for backend service

[maxi-cit]

part of: hashicorp/terraform-provider-google#6376

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compute: Added example and test for dynamic backend count for `google_compute_region_backend_service`

[github-actions]

Hello! I am a robot. Tests will require approval from a repository maintainer to run. Googlers: see go/terraform-auto-test-runs to set up automatic test runs.

@zli82016, a repository maintainer, has been assigned to review your changes. If you have not received review feedback within 2 business days, please leave a comment on this PR asking them to take a look.

You can help make sure that review is quick by doing a self-review and by running impacted tests locally.

[modular-magician]

Hi there, I'm the Modular magician. I've detected the following information about your changes:

Diff report

Your PR generated some diffs in downstreams - here they are.

google provider: Diff ( 3 files changed, 268 insertions(+))
google-beta provider: Diff ( 3 files changed, 268 insertions(+))
Open in Cloud Shell: Diff ( 4 files changed, 144 insertions(+))

[modular-magician]

Tests analytics

Total tests: 1160
Passed tests: 1079
Skipped tests: 79
Affected tests: 2

Click here to see the affected service packages

• compute

Action taken

Found 2 affected test(s) by replaying old test recordings. Starting RECORDING based on the most recent commit. Click here to see the affected tests

• TestAccComputeRegionBackendService_regionBackendServiceDynamicBackendCountExample
• TestAccComputeRegionBackendService_withDynamicBackendCount

Get to know how VCR tests work

[modular-magician]

🟢 Tests passed during RECORDING mode:
TestAccComputeRegionBackendService_withDynamicBackendCount [Debug log]

🟢 No issues found for passed tests after REPLAYING rerun.

---

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

🔴 Errors occurred during RECORDING mode. Please fix them to complete your PR.

View the build log or the debug log for each test

[modular-magician]

Hi there, I'm the Modular magician. I've detected the following information about your changes:

Diff report

Your PR generated some diffs in downstreams - here they are.

google provider: Diff ( 2 files changed, 190 insertions(+))
google-beta provider: Diff ( 2 files changed, 190 insertions(+))

[modular-magician]

Tests analytics

Total tests: 1159
Passed tests: 1080
Skipped tests: 79
Affected tests: 0

Click here to see the affected service packages

• compute

🟢 All tests passed!

View the build log