refactor: reuse the filewatcher for file-provider

[shawnh2]

What type of PR is this?

What this PR does / why we need it:

Which issue(s) this PR fixes:

replace #4475

Release Notes: No

[codecov]

Codecov Report

Attention: Patch coverage is 41.81818% with 64 lines in your changes missing coverage. Please review.

Project coverage is 66.06%. Comparing base (e6d3526) to head (6609a59).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
internal/provider/file/file.go	0.00%	53 Missing ⚠️
internal/provider/file/store.go	0.00%	5 Missing ⚠️
internal/filewatcher/worker.go	85.00%	2 Missing and 1 partial ⚠️
internal/utils/path/path.go	86.95%	2 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4807      +/-   ##
==========================================
+ Coverage   65.68%   66.06%   +0.38%     
==========================================
  Files         211      209       -2     
  Lines       32064    31890     -174     
==========================================
+ Hits        21060    21069       +9     
+ Misses       9761     9578     -183     
  Partials     1243     1243              

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[zirain]

LGTM, it would be good if we can have some tests for file provider.

[shawnh2]

LGTM, it would be good if we can have some tests for file provider.

Have some tests on my local env, will add them as a follow-up