rename TLSSecretFileMode to ReadWriteOnlyFileMode

[pdabelf5]

Proposed changes

Make file mode const generic to re-use for other file types

Checklist

Before creating a PR, run through this checklist and mark each as complete.

• I have read the CONTRIBUTING doc
• I have added tests that prove my fix is effective or that my feature works
• I have checked that all unit tests pass after adding my changes
• I have updated necessary documentation
• I have rebased my branch onto main
• I will ensure my PR is targeting the main branch and pulling from my branch from my own fork

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 6 lines in your changes missing coverage. Please review.

Project coverage is 53.25%. Comparing base (6007227) to head (0a1b694).
Report is 5 commits behind head on main.

Files with missing lines	Patch %	Lines
internal/configs/configurator.go	0.00%	4 Missing ⚠️
cmd/nginx-ingress/main.go	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6854      +/-   ##
==========================================
+ Coverage   53.23%   53.25%   +0.01%     
==========================================
  Files          88       88              
  Lines       20354    20354              
==========================================
+ Hits        10835    10839       +4     
+ Misses       9074     9072       -2     
+ Partials      445      443       -2     

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