### Tasks
- [ ] Remove `APISelfSubjectReview` feature gate in `v1.31`, update docs
- [ ] Remove alpha APIs (can happen any time since we have the GA API), update docs
- [ ] Mark beta APIs deprecated (can happen any time since we have the GA API), update docs
- [ ] Remove beta APIs in `v1.31`, update docs

/sig auth
/assign nabokihms

Originally posted by nabokihms in kubernetes/enhancements#3325 (comment)