test_runner: added restart log in test-runner/runner.js

[sivakumar-77]

Fixes #57206

Added restart log in test-runner/runner.js to log with timestamp and test-file
whenever the test file is restart testing in --watch mode.

[nodejs-github-bot]

Review requested:

• @nodejs/test_runner

[pmarchini]

Hey @sivakumar-77, thanks for opening this PR! 🚀

I think we should avoid adding process.stdout.write directly inside the runner restart logic.

I would suggest adding a new event, like the existing one, test:watch:drained, to allow users to customise the behaviour while avoiding unwanted output in existing custom reporters.
I would then suggest handling the new event in the internal reporters (spec, tap, etc.).

Could you also please add tests to cover this feature?

[sivakumar-77]

Hey @pmarchini thanks for the feedback! 🙌

That makes sense—I’ll update the PR to introduce a new event instead of directly modifying the runner restart logic. I’ll also update the internal reporters to handle it appropriately.

I'll add tests to cover this feature as well. Thanks