fix invalid build_config.worker_pool in cloudrunv2 example and test

[dixuswe]

This is to fix failed acceptance tests TestAccCloudRunV2Service

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[github-actions]

Hello! I am a robot. Tests will require approval from a repository maintainer to run.

Googlers: For automatic test runs see go/terraform-auto-test-runs.

@ScottSuarez, 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, 4 deletions(-))
google-beta provider: Diff ( 3 files changed, 4 deletions(-))
Open in Cloud Shell: Diff ( 1 file changed, 1 deletion(-))

[modular-magician]

Tests analytics

Total tests: 79
Passed tests: 69
Skipped tests: 8
Affected tests: 2

Click here to see the affected service packages

• cloudrunv2

#### 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

• TestAccCloudRunV2Service_cloudrunv2ServiceFunctionExample
• TestAccCloudRunV2Service_cloudrunv2ServiceFunctionExample_update

Get to know how VCR tests work

[modular-magician]

🟢 Tests passed during RECORDING mode:
TestAccCloudRunV2Service_cloudrunv2ServiceFunctionExample [Debug log]
TestAccCloudRunV2Service_cloudrunv2ServiceFunctionExample_update [Debug log]

🟢 No issues found for passed tests after REPLAYING rerun.

---

🟢 All tests passed!

View the build log or the debug log for each test

[ScottSuarez]

approved but will give time for @ian-mi to review