PullRequest.find_existing_pull_request will return a remote PullRequest object for the current branch. It would be useful if this function also allowed the caller to specify the branch.
<rdar://problem/115084502>
Pull request: https://github.com/WebKit/WebKit/pull/17518
Committed 268045@main (dedaf00ab9cd): <https://commits.webkit.org/268045@main> Reviewed commits have been landed. Closing PR #17518 and removing active labels.