eliminate Bazel's libtorch_python_generated_sources
Pull Request resolved: https://github.com/pytorch/pytorch/pull/76178
These contents are already identified in the shared build structure.
Differential Revision: [D35817999](https://our.internmc.facebook.com/intern/diff/D35817999/)
**NOTE FOR REVIEWERS**: This PR has internal Facebook specific changes or comments, please review them on [Phabricator](https://our.internmc.facebook.com/intern/diff/D35817999/)!
Approved by: https://github.com/dreiss
Author
Michael Andreas Dagitses
