test_runner: match coverage globs against cwd-relative paths

[ace-tk]

Summary

• apply coverage include/exclude glob matching using cwd-relative paths only
• avoid accidentally excluding files when absolute parent directories contain names like test
• add a regression test for default coverage exclusion with cwd containing a test directory segment

Test plan

• not run in this environment (no local Node core build)
• run: python3 tools/test.py test/parallel/test-runner-coverage-default-exclusion.mjs

Closes: #58654

[nodejs-github-bot]

Review requested:

• @nodejs/test_runner

[avivkeller]

Ref on why this approach was chosen originally (by me): #53553 (comment)

[ace-tk]

@avivkeller

My goal was to prevent unexpected exclusions caused by absolute parent paths containing test. If changing this behavior is not preferred, I can close this and submit a docs-only clarification PR instead. Happy to follow your preferred direction.

[avivkeller]

cc @nodejs/test_runner

[ace-tk]

@avivkeller Thanks for the context and for cc-ing @nodejs/test_runner.

My intent was to avoid surprising exclusions when absolute parent paths contain test, but I understand this may conflict with the original design tradeoff in #53553

[github-actions]

This pull request has been marked as stale due to 90 days of inactivity.
It will be automatically closed in 30 days if no further activity occurs. If this is still relevant, please leave a comment or update it to keep it open.