Don't attempt to reopen a PR after updating a branch if it already exists #1944
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The PR remediation was checking if a PR with the same contents already
exist as a fast and cheap check to avoid triggering the remediation
again. But in case the profile changes or the contents change for
another reason, we want to push to the existing branch to update it, but
don't try to open a PR again as that would fail with 422.
To do that, this patch adds a check if a PR is already open from the
branch we just pushed to and if it is, just returns before opening the
PR again.