Add ability to set file permissions after writing an SFTP file. Resol…

[funkyshu]

…ves #202.

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 28.75000% with 342 lines in your changes missing coverage. Please review.

Project coverage is 21.03%. Comparing base (8b7451b) to head (089b625).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
backend/sftp/mocks/Client.go	25.52%	127 Missing and 16 partials ⚠️
backend/sftp/mocks/FileInfo.go	5.88%	92 Missing and 4 partials ⚠️
backend/sftp/mocks/ReadWriteSeekCloser.go	29.62%	80 Missing and 15 partials ⚠️
backend/sftp/file.go	84.61%	4 Missing and 2 partials ⚠️
utils/utils.go	0.00%	2 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##             main     #203      +/-   ##
==========================================
- Coverage   21.71%   21.03%   -0.69%     
==========================================
  Files          59       61       +2     
  Lines       19301    20341    +1040     
==========================================
+ Hits         4192     4278      +86     
- Misses      14648    15565     +917     
- Partials      461      498      +37     

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[funkyshu]

simplified timer here...technically unrelated to the actual changes