Add: Check for creation date <= last modification date

[n-thumann]

What

This PR adds a check to the creation date check to check whether the creation_date is smaller than / equal last_modification

Why

Because a VT cannot be modified before it has been created.

References

Jira: VTOPS-210
Depends on: greenbone/vulnerability-tests#16642

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 e9c3014.

Ensure that dependencies are being submitted on PR branches and consider enabling retry-on-snapshot-warnings. See the documentation for more information and troubleshooting advice.

OpenSSF Scorecard

Package	Version	Score	Details

Scanned Files

[github-actions]

Conventional Commits Report

Type	Number
Added	2
Changed	1

🚀 Conventional commits found.

[codecov]

Codecov Report

Attention: Patch coverage is 94.73684% with 1 line in your changes missing coverage. Please review.

Project coverage is 79.84%. Comparing base (40ef76a) to head (e9c3014).
Report is 6 commits behind head on main.

Files with missing lines	Patch %	Lines
troubadix/plugins/creation_date.py	94.73%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #799      +/-   ##
==========================================
+ Coverage   79.81%   79.84%   +0.03%     
==========================================
  Files          87       87              
  Lines        3022     3027       +5     
  Branches      589      591       +2     
==========================================
+ Hits         2412     2417       +5     
  Misses        462      462              
  Partials      148      148              

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