fix: stop the runner before restarting, restart on workspace config change

[sheremet-va]

Description

Fixes #6738 FIxes #5327

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[sheremet-va]

@hi-ogawa @AriPerkkio added the test. interested to know your opinion on the useFS helper

[AriPerkkio]

Looks handy and easy to read. Sometimes it's nicer to have static fixtures directory but in cases like this where they are not shared between multiple tests, re-creating fixtures on test run makes sense.

The reruns tests when configs change test case does a lot of file writing so it might be slow on CI. Looks like it did pass though.

[sheremet-va]

The reruns tests when configs change test case does a lot of file writing so it might be slow on CI. Looks like it did pass though.

Maybe we can emit the event manually instead of waiting then 🤔

[sheremet-va]

It takes 1200-1300ms in CI, the same locally for me. Takes the longest on Windows - 1700ms, but changing to use watcher.emit didn't improve times significantly 🤷🏻

[sheremet-va]

Should we cleanup root entirely? (though I might even want a mode with env var where it leaves files without being deleted to debug later)

Removing the root now.

But, looking at playwright's ones, they make use of a lot of small runInlineTest and it looks nice.

Added a similar helper!