add secret type for getAndValidateSecret()

[pdabelf5]

Proposed changes

refactor of getAndValidateSecret() in preparation for r33 secrets

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 11 lines in your changes missing coverage. Please review.

Project coverage is 53.21%. Comparing base (8b8fc52) to head (7c1f9f3).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
cmd/nginx-ingress/main.go	0.00%	11 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6877      +/-   ##
==========================================
- Coverage   53.24%   53.21%   -0.03%     
==========================================
  Files          88       88              
  Lines       20363    20365       +2     
==========================================
- Hits        10842    10838       -4     
- Misses       9078     9082       +4     
- Partials      443      445       +2     

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