c2fc485327
## Proposed changes Change `use_cnt` mechanism for incremental (auto partition) channels and streams, it's now dynamically counted. Use `close_wait()` of regular partitions as a synchronize point to make sure all sinks are in close phase before closing any incremental (auto partition) channels and streams. Add dummy (fake) partition and tablet if there is no regular partition in the auto partition table. Backport #35287 Co-authored-by: zhaochangle <zhaochangle@selectdb.com>