fix: watch exclude flag with watch flag for the directory containing the excluded file

[HasanAlrimawi]

closes #26217

Changes

• Check and suppress restarting if the changed file is marked to be excluded from watching.

Problem Root

In cli/util/file_watcher.rs this line let _ = watcher.watch(path, RecursiveMode::Recursive);.
This causes issue if the path is directory since this will recursively watch all files and subdirectories, thus the excluded files will be watched if they are within that directory.

P.S. I initially tried to solve the issue by: (Failed approaches)
1) Using watcher.watch() for every file and folder within the directory and avoiding watching the excluded file and the directory itself, but that will prevent watching any new files made during runtime within the directory.
2) Using watcher.unwatch() for the excluded file but that didn't work, since the directory is watched. I noticed the same issue tracked in this issue.

[bartlomieju]

@HasanAlrimawi thanks for the PR. Do you think you could add a test for this change?

[HasanAlrimawi]

@bartlomieju
The test I added never folds under the ci / test debug windows-x86_64 check although it succeeds in all other checks and runs successfully on my local machine running on windows.

Could you help with that?