Tracking issue for Next-Gen TiDB

## Development Task
This issue is used to track the development or bug fix progress of PD when adapting to the new architecture of TiDB.

### Keyspace

- [x] https://github.com/tikv/pd/issues/9414
- [x] https://github.com/tikv/pd/issues/9348
- [x] https://github.com/tikv/pd/issues/9704

### Resource control
The status of the resource control is tracked separately by
- [ ] https://github.com/tikv/pd/issues/9296

### GC
The status of the new GC API is tracked separately by
- [x] https://github.com/tikv/pd/issues/8978

### Misc
- [x] https://github.com/tikv/pd/issues/9350
- [x] https://github.com/tikv/pd/issues/9629

### Bug fix
- [x] https://github.com/tikv/pd/issues/9448
- [x] https://github.com/tikv/pd/issues/9355
- [x] https://github.com/tikv/pd/issues/9417
- [x] https://github.com/tikv/pd/issues/9652
- [x] https://github.com/tikv/pd/issues/9640
- [x] https://github.com/tikv/pd/issues/9367
- [x] https://github.com/tikv/pd/issues/9482
- [ ] https://github.com/tikv/pd/issues/9555
- [x] https://github.com/tikv/pd/issues/9724
- [ ] https://github.com/tikv/pd/issues/9727
- [x] https://github.com/tikv/pd/issues/9729

### Testing
- [x] https://github.com/tikv/pd/issues/9806