Auto compaction doesn't work when the overlord runs in the "local" mode

### Affected Version

All versions

### Description

In auto compaction, the coordinator gets the worker (middleManager/indexer) information from the overlord to compute the total number of task slots. But if the overlord runs in the local mode, it will return a 500 error with "Task Runner does not support worker listing" which in turn leading to the failure of auto compaction.

I think we can just simply use only `maxCompactionTaskSlots` if the overlord is running in the local mode. Slightly related, the default value of `maxCompactionTaskSlots` is `Integer.MAX_VALUE` and could be limited to some value.

No files or tests are named. Start by tracing auto compaction's coordinator lookup of worker information through the overlord and its local-mode task runner. Done means local mode no longer fails on unsupported worker listing and uses maxCompactionTaskSlots instead; verify the relevant auto-compaction behavior with tests.

Written by the indexing model from the issue text.