stubsabot: only update existing branches if the diff relative to master
would be different
#8854
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Currently, if there are no non-stubsabot commits on a stubsabot branch associated with an open PR, stubsabot will force-push to that branch on a daily basis to update the PR.
This PR proposes tweaking that logic so that stubsabot will only update the PR branch if it would change the diff between the PR and master.