Remote cluster sqlite cache leak

[fspmarshall]

Sqlite cache instances aren't cleaned up when remote clusters go offline and/or when the remote cluster resource is destroyed. This is intended behavior for local cluster cache. We need alternative behavior for remote clusters.

[zmb3]

@espadolini can we close this since sqlite caches no longer exist?

[espadolini]

SQLite caches are not a thing anymore (so there's nothing to delete on disk), and even the in-memory caches for disconnected remote clusters are cleaned up after #11435.