rebase via comment
Fixes #ISSUE_NUMBER
start rebase bot
random testing on my fork, using `on: issue_comment` https://github.com/clee2000/pytorch/pull/6
stealing both code and an identity from mergebot
corresponding pr on test-infra https://github.com/pytorch/test-infra/pull/305
doesnt do ghstack
should accept "@pytorchbot rebase me", "@pytorchbot rebase this", "@pytorchmergebot rebase this"
Pull Request resolved: https://github.com/pytorch/pytorch/pull/76262
Approved by: https://github.com/janeyx99, https://github.com/seemethere
