Validating the label values against regex

[Akshay2191]

Implemented a function to validate the label value against regex to align it with N1C.

Checklist

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• 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 84.90%. Comparing base (383ce95) to head (df5fd43).
⚠️ Report is 8 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1345      +/-   ##
==========================================
+ Coverage   84.88%   84.90%   +0.02%     
==========================================
  Files         100      100              
  Lines       14520    14540      +20     
==========================================
+ Hits        12325    12345      +20     
  Misses       1734     1734              
  Partials      461      461              

Files with missing lines	Coverage Δ
internal/config/config.go	85.71% <100.00%> (+0.14%)	⬆️

... and 2 files with indirect coverage changes

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[aphralG]

Why the change in the label, will spaces no longer be allowed ?

[dhurley]

yeah thats correct. We are enforcing more strict rules on what values labels can have.