Add patch and diff formats for compare controller

Heinrich Lee Yurequested to merge
217206-patch-endpoint-for-compare into master

What does this MR do and why?

This allows fetching of a diff or patch file from a compare URL by adding the format param. UI button will be added separately.

The docs are being worked on in !194453 (merged)

References

Related to #217206 (closed)

How to set up and validate locally

  1. Visit a compare URL (e.g. http://gdk.test:3000/flightjs/Flight/-/compare/fix-event-currentTarget...master)
  2. Append the URL query param ?format=diff or ?format=patch

You should see a diff / patch file format of the diff

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Edited by Heinrich Lee Yu

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