Pull request commits now ordered chronologically

We are changing the way commits are ordered in the pull request timeline and commits view. Commits are currently ordered by author date, which can cause commits to appear out of order in some scenarios, like after rebasing. With this change, commits are ordered according to their chronological order in the head branch, which is consistent with the ordering in Git.

This ordering is also reflected in the List commits on a pull request REST API and PullRequest object's timeline connection in GraphQL.

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