[server]: remove orphan files and directories when tablet starts up

[gyang94]

Purpose

Linked issue: close #3387

Brief change log

Two changes, one in each cleanup path:

1. ReplicaManager: handle NoneReplica with deleteLocal=true

When the NoneReplica branch receives deleteLocal=true, look up the bucket in LogManager.currentLogs. If present, the log tablet was loaded at startup but never registered in allReplicas — it is an orphan. Drop the log via logManager.dropLog(), delete the sibling KV tablet directory (via kvManager.dropKv() if loaded, otherwise direct FileUtils.deleteDirectory), update disk usage accounting, and record the parent directory for empty-dir cleanup.

This handles the partition deletion scenario.

2. LogManager: clean up empty parent directories in SchemaNotExistException handler

After the existing handler deletes log-N/ and kv-N/, check whether the parent directory is empty and delete it. For partitioned tables, also check the grandparent (table directory). For non-partitioned tables, the grandparent is the database directory and must NOT be deleted. This is safe under parallel loadAllLogs execution — deleteDirectoryQuietly tolerates races.

This handles the table deletion scenario.

Tests

API and Format

Documentation