在等到下线节点的分片迁移到其他节点之后，缩容任务依然卡着不动，从缩容日志看缩容操作还在进行中
FE日志：
2025-07-23 17:19:18,192 INFO (cluster|15) [SystemInfoService.dropBackend():284] finished to drop Backend [id=37141952, host=192.168.122.24, heartbeatPort=9050, alive=true, lastStartTime=2025-07-23 15:24:16, process epoch=1753255456235, tags: {location=default}]
2025-07-23 17:19:18,192 INFO (cluster|15) [SystemHandler.runAlterJobV2():100] no available tablet on decommission backend 37141952, drop it
2025-07-23 17:19:18,196 INFO (tablet scheduler|28) [TabletScheduler.updateWorkingSlots():227] delete non exist backend: 37141952
