Draft: Introduce new diffs/diffs component
What does this MR do and why?
Describe in detail what your merge request does and why.
This is the first iteration in adding a new view component to replace the diffs/diffs
partial. As this is the first iteration it duplicates a bunch of helper methods and inherits a few gaps in test coverage from the original view, which will be addressed in follow-up MRs as the previous implementation is removed.
Related #321299 (closed)
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How to set up and validate locally
Numbered steps to set up and validate the change are strongly suggested.
MR acceptance checklist
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I have evaluated the MR acceptance checklist for this MR.
Edited by Robert May