Add/agents support bundle

[ozgen]

What

• Preserve binary HTTP response data without relying on string length.
• Store the exact response size in gvm_http_response_t.
• Capture the Content-Disposition response header.
• Add support for downloading an agent support bundle.
• Extract and return the support bundle filename.
• Add unit tests for binary data, filename parsing, request construction, and error cases.

Why

• Support bundles contain binary data and may include null bytes.
• Using string-based handling can truncate or corrupt binary responses.
• The filename is provided through the Content-Disposition header and is needed when saving the downloaded bundle.
• Tests ensure binary content, metadata, and failure cases are handled correctly.

References

GEA-1833

Checklist

• Tests

[github-actions]

Dependency Review

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

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