Delegate Go Proxy archive generation to Workhorse SendArchive

What does this MR do?

Calls Gitlab::Workhorse.send_git_archive when generating an archive for Go proxy requests.

Closes #221358, #218083, #223577

Does this MR meet the acceptance criteria?

Conformity

• Changelog entry
• Merge request performance guidelines
• Style guides
• Separation of EE specific content

Availability and Testing

• Review and add/update tests for this feature/bug. Consider all test levels. See the Test Planning Process.