Collapsible commits in conversation view

[njm506]

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When dealing with PRs with a lot of commits, the conversation view ends up having large commit sections in it before and between conversations. While it's very useful to see when changes were made in relation to conversation, it would be very useful to have the commit details collapsible so it's easier to digest the conversation itself.

For example, if there is a single commit between two conversation items, it would show; if there were more than about three, it'd be useful to have a collapsible section that said e.g. "77 commits between X and Y" that could be expanded if I need to see what those were. I can always see the commit history in the Commits tab anyway. See the following somewhat pathological case for why I noticed this:

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