Support diff versions when downloading merge request diff or patch files

Heinrich Lee Yurequested to merge
373246-merge-request-patches-diff-id into master

What does this MR do and why?

Support diff versions when generating merge request diff or patch files

Add support for downloading diff and patch files when viewing a specific MR diff version.

References

Related to #373246 (closed)

How to set up and validate locally

  1. Open a merge request with multiple diff versions. You can push to the MR branch multiple times to generate one.
  2. On the changes tab, change the "Compare" dropdowns to any version
  3. Append .diff / .patch to the URL path

It should generate the patch / diff based on the selected compare versions. The generated file should be consistent with what's shown on the web UI.

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Edited by Heinrich Lee Yu

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