Unified diff components breaks Sourcegraph in MR

Description

Recently there's been some effort at cleaning up our diff components. This includes moving them from a <table>/<tr> structure to a css grid based structure.

Unfortunately, this breaks Sourcegraph form being able to detect the code info, since it's hardcoded to look for parent tr.

Proposal

Probably the fastest path forward is to assist Sourcegraph in updating their parser.

Crazy/not-crazy idea

This seems like a good opportunity for me to share this proposal #233999. As opposed to forcing third-party extensions to have to traverse our ever-changing DOM structure, we could provide a API which they could interface with and plugin custom behavior.