viable/strict/1792355188: [GHF] Refresh reverted stack branches with the merge bot (#199717)

发生了什么

Impact: pytorchmergebot revert flow ( trymerge.py --revert ): after a non-ghstack revert has landed and reopened its PRs, it reads their stack and may push merge commits to their branches. PRs outside a stack, fork PRs and dry runs get no push and no comment Risk: low What After a stack revert, refresh_reverted_branches merges the default branch into the reverted PRs' branches with the rebase engine whenever merging…

摘要按规则整理自下方来源原文

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