add: add download_report_export request support

[ozgen]

What

• Add download_report_export request support
• Add tests for request generation

Why

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

References

GEA-2058
depending on greenbone/gvmd#3124

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 495f008.

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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 98.38%. Comparing base (1bb3782) to head (495f008).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1377   +/-   ##
=======================================
  Coverage   98.37%   98.38%           
=======================================
  Files         104      104           
  Lines        6788     6797    +9     
  Branches     1231     1232    +1     
=======================================
+ Hits         6678     6687    +9     
  Misses         77       77           
  Partials       33       33           

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