Change logger identifier from 'index' to 'test-utils'

[Copilot]

Summary

Addresses feedback on PR #3309 to use a more descriptive logger identifier for improved log tracing.

Changes

• Changed logger identifier from 'index' to 'test-utils' in packages/test-utils/src/index.ts

The generic 'index' identifier made it difficult to distinguish logs when multiple packages have index.ts files. The new identifier aligns with the package name @streamr/test-utils.

Checklist before requesting a review

• Is this a breaking change? If it is, be clear in summary.
• Read through code myself one more time.
• Make sure any and all TODO comments left behind are meant to be left in.
• Has reasonable passing test coverage?
• Updated changelog if applicable.
• Updated documentation if applicable.

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Note

Logging

• Update logger initialization to new Logger('test-utils') (was 'index') in packages/test-utils/src/index.ts to improve log namespacing.

^{Written by Cursor Bugbot for commit f5f936e. This will update automatically on new commits. Configure here.}

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