Update Label Validation

[aphralG]

Proposed changes

Update Labels Regex to allow . so that product version can be sent as labels
Expand unit tests

Checklist

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

• I have read the CONTRIBUTING document
• I have run make install-tools and have attached any dependency changes to this pull request
• If applicable, I have added tests that prove my fix is effective or that my feature works
• If applicable, I have checked that any relevant tests pass after adding my changes
• If applicable, I have updated any relevant documentation (README.md)
• If applicable, I have tested my cross-platform changes on Ubuntu 22, Redhat 8, SUSE 15 and FreeBSD 13

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 86.30%. Comparing base (34a13e6) to head (1a4204a).
⚠️ Report is 1 commits behind head on release-3.5.1.

Additional details and impacted files

@@                Coverage Diff                @@
##           release-3.5.1    #1390      +/-   ##
=================================================
- Coverage          86.41%   86.30%   -0.11%     
=================================================
  Files                102      102              
  Lines              12585    12585              
=================================================
- Hits               10875    10862      -13     
- Misses              1233     1248      +15     
+ Partials             477      475       -2     

Files with missing lines	Coverage Δ
internal/config/config.go	87.23% <ø> (ø)

... and 6 files with indirect coverage changes

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