Add httpassert header validation

[stefanTolksdorf]

What

• Add httpassert header validation

References

Checklist

• Tests

[github-actions]

Dependency Review

✅ No vulnerabilities or license issues or OpenSSF Scorecard issues found.

Snapshot Warnings

⚠️: No snapshots were found for the head SHA 7ae271a.

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Scanned Files

None

[github-actions]

Conventional Commits Report

😢 No conventional commits found.

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[codecov]

Codecov Report

❌ Patch coverage is 65.47619% with 29 lines in your changes missing coverage. Please review.
✅ Project coverage is 57.71%. Comparing base (7ef2d65) to head (7ae271a).
⚠️ Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
pkg/httpassert/extracter.go	57.35%	21 Missing and 8 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #286      +/-   ##
==========================================
+ Coverage   57.67%   57.71%   +0.04%     
==========================================
  Files          69       69              
  Lines        3813     3862      +49     
==========================================
+ Hits         2199     2229      +30     
- Misses       1433     1445      +12     
- Partials      181      188       +7     

Flag	Coverage Δ
opensearch-tests	95.66% <ø> (ø)
postgres-tests	91.96% <ø> (ø)
unit-tests	52.30% <65.47%> (+0.13%)	⬆️

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