test(security-center): fix concurrent modification error in management api tests

[angelcaamal]

Description

Fixes Internal : b/515074301

Note: Before submitting a pull request, please open an issue for discussion if you are not associated with Google.

• Fixed API Concurrency Collisions (package.json)

  • Removed the parallel execution flags (-p -j 2) from the test script. Running tests sequentially eliminates the 10 ABORTED: Failed to create module due to concurrent modification errors caused by workers clashing over the same global resources.

• Resolved Resource Leaks in Notifications V2 (ALREADY_EXISTS)

  • Implemented dynamic Pub/Sub topic naming using uuidv1() to prevent collisions between test runs.
  • Enhanced the teardown logic in the after hook to explicitly delete the Notification Config (deleteNotificationConfig) alongside the Pub/Sub topic, preventing orphaned resources.

• Stabilized Custom Module Tests (createSecurityHealthAnalyticsCustomModule)

  • Leveraged Mocha's native this.retries(3) to gracefully handle any residual API timeouts or flakiness.
  • Moved the SecurityCenterManagementClient instantiation to the describe block scope and added await client.close() in the teardown hook to ensure proper gRPC connection closure.

• Fixed Unhandled Promise Rejections in Mute Rules V2

  • Wrapped the createMuteConfig API call in a try...catch block. This prevents silent API failures from returning undefined and throwing misleading TypeError: (intermediate value) is not iterable destructuring errors, allowing Mocha to correctly report the underlying API issue.

Checklist

• I have followed guidelines from CONTRIBUTING.MD and Samples Style Guide
• Tests pass: npm test (see Testing)
• Lint pass: npm run lint (see Style)
• Required CI tests pass (see CI testing)
• These samples need a new API enabled in testing projects to pass (let us know which ones)
• These samples need a new/updated env vars in testing projects set to pass (let us know which ones)
• This pull request is from a branch created directly off of GoogleCloudPlatform/nodejs-docs-samples. Not a fork.
• This sample adds a new sample directory, and I updated the CODEOWNERS file with the codeowners for this sample
• This sample adds a new sample directory, and I created GitHub Actions workflow for this sample
• This sample adds a new Product API, and I updated the Blunderbuss issue/PR auto-assigner with the codeowners for this sample
• Please merge this PR for me once it is approved

Note: Any check with (dev), (experimental), or (legacy) can be ignored and should not block your PR from merging (see CI testing).

[gemini-code-assist]

Code Review

This pull request refactors the security health analytics custom module tests by moving the SecurityCenterManagementClient instantiation to the describe block scope and adding a client.close() call in the after hook for better resource management. It also introduces a retry mechanism with exponential backoff in the before hook to handle concurrent modification errors (code 10) during module creation. I have no feedback to provide as there were no review comments.