test(worker): gate test utility diagnostic logs

[zebbern]

Summary

• gate worker test helper TRACE:/LOG: console mirroring behind SENTRIS_DEBUG_TESTS=1
• keep trace/log collector behavior unchanged for assertions
• add a regression test covering default quiet behavior and explicit debug opt-in

Verification

• red test first: bun test worker/src/testing/__tests__/test-utils.test.ts failed with 2 default console.log calls
• bun test worker/src/testing
• bun test worker/src/components/it-automation
• git diff --check
• bun run lint
• bun run test
• bun run typecheck
• git push -u origin codex/quiet-worker-test-utils pre-push hook

[Copilot]

Pull request overview

This PR reduces noise in worker tests by gating the createMockTrace() / createMockLogCollector() console mirroring behind an opt-in env var (SENTRIS_DEBUG_TESTS=1), while preserving the underlying event/log collection used for assertions.

Changes:

• Add shouldMirrorTestDiagnostics() to conditionally mirror TRACE: / LOG: output only when SENTRIS_DEBUG_TESTS === '1'.
• Keep trace/log collection behavior unchanged (events/logs are still recorded for tests to assert on).
• Add a regression test verifying default quiet behavior and explicit debug opt-in.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
worker/src/testing/test-utils.ts	Gates diagnostic console.log mirroring behind SENTRIS_DEBUG_TESTS=1 without changing collected trace/log data.
worker/src/testing/__tests__/test-utils.test.ts	Adds coverage ensuring console mirroring is off by default and on when explicitly enabled.

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