Improved hooks monitoring

...to work for specific edge cases with a simpler solution.
Re-reads hooks directories after any changes are detected by the watchers.
Added monitoring test for adding a different invalid hook to primary directory.
Some issues with prior code:
- ReadDir would stop when it encounters an invalid hook, rather than registering an error but continuing to read the valid hook.
- Wouldn’t account for Rename and Chmod events.
- After doing a mv of the hooks file instead of rm, it would still think the hooks file is in the directory, but it has been moved to another location.
- If a hook file was renamed, it would register the renamed file as a separate hook and not delete the original, so it would then execute the hook twice - once for the renamed file, and once for the original name which it did not delete.

Signed-off-by: samc24 <sam.chaturvedi24@gmail.com>

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