Validating the label values against regex

[Akshay2191]

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

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 86.36%. Comparing base (383ce95) to head (77a5582).
⚠️ Report is 19 commits behind head on main.

Additional details and impacted files

@@ Coverage Diff @@ ## main #1345 +/- ## ========================================== + Coverage 84.88% 86.36% +1.48%  ========================================== Files 100 102 +2 Lines 14520 12519 -2001 ========================================== - Hits 12325 10812 -1513  + Misses 1734 1230 -504  - Partials 461 477 +16 

Files with missing lines	Coverage Δ
internal/config/config.go	87.05% <100.00%> (+1.48%)	⬆️

... and 99 files with indirect coverage changes

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