pytorch

dbdddb09 - [BE] delete GHA generated workflow files before regen (#63148)

[BE] delete GHA generated workflow files before regen (#63148) Summary: Unlike circle which all workflow goes in one file, GHA legacy generated files will stay silently in once's PR. e.g. when we change build_environment name and that's not ideal. Pull Request resolved: https://github.com/pytorch/pytorch/pull/63148 Reviewed By: bdhirsh Differential Revision: D30283382 Pulled By: walterddr fbshipit-source-id: ffdd5bf9561dd38499052855a12ee5cf838a20b0