add: add export_scan_report request support

[ozgen]

What

• Add export_scan_report request support
• Add validation for report_id
• Support filter strings and saved filter IDs
• Add tests for request generation and missing IDs

Why

• Allow python-gvm clients to use the new export_scan_report GMP command

References

GEA-2008

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 9d0becd.

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Scanned Files

None

[github-actions]

Conventional Commits Report

Type	Number
Added	1

🚀 Conventional commits found.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.37%. Comparing base (69e195a) to head (9d0becd).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1363   +/-   ##
=======================================
  Coverage   98.36%   98.37%           
=======================================
  Files         103      103           
  Lines        6748     6768   +20     
  Branches     1226     1229    +3     
=======================================
+ Hits         6638     6658   +20     
  Misses         77       77           
  Partials       33       33           

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