Add http assert matcher NotEmpty

[stefanTolksdorf]

What

• http assert matcher NotEmpty

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 e3d09cf.

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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 66.66667% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 57.39%. Comparing base (3a6c802) to head (e3d09cf).
⚠️ Report is 4 commits behind head on main.

Files with missing lines	Patch %	Lines
pkg/httpassert/matcher.go	66.66%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #291      +/-   ##
==========================================
+ Coverage   57.38%   57.39%   +0.01%     
==========================================
  Files          69       69              
  Lines        3900     3906       +6     
==========================================
+ Hits         2238     2242       +4     
- Misses       1474     1475       +1     
- Partials      188      189       +1     

Flag	Coverage Δ
opensearch-tests	95.68% <ø> (ø)
postgres-tests	92.03% <ø> (ø)
unit-tests	51.96% <66.66%> (+0.02%)	⬆️

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