adding a filetype check

[Akshay2191]

Adding file type check to prevent Agent blocking on non-regular files during config apply.

[codecov]

Codecov Report

❌ Patch coverage is 95.45455% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 88.91%. Comparing base (cea3092) to head (3cb2cb5).

Files with missing lines	Patch %	Lines
internal/file/file_service_operator.go	87.50%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1947      +/-   ##
==========================================
- Coverage   88.94%   88.91%   -0.03%     
==========================================
  Files         111      111              
  Lines       12426    12444      +18     
==========================================
+ Hits        11052    11065      +13     
- Misses       1372     1377       +5     
  Partials        2        2              

Files with missing lines	Coverage Δ
internal/file/file_operator.go	76.27% <100.00%> (+0.37%)	⬆️
internal/watcher/file/file_watcher_service.go	86.75% <100.00%> (+0.74%)	⬆️
internal/file/file_service_operator.go	85.88% <87.50%> (+0.17%)	⬆️

... and 1 file with indirect coverage changes

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