trunk/14c5b96bfa18be17d9845bbb060a095fc762ca8c: [GHF] Merge GitHub-native PR stacks with the merge bot (#199714)

发生了什么

Impact: pytorchmergebot merge flow ( trymerge.py ) for same-repo PRs based on another PR's branch in a main-based GitHub-native stack, refused today. ghstack PRs, fork PRs and PRs on the default branch are unchanged; other PRs on a non-default base still get a refusal, after one GraphQL query Risk: medium What pytorchbot merge on a PR of a main-based native stack lands every open PR from the lowest one up to that PR…

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