Delete metadata caches on database/table delete

[hiltontj]

Problem

When a database or table is deleted, the related metadata caches are not being deleted.

Proposed solution

Following how last caches are cleaned up (see linked PRs below), we need to do the same for metadata caches.

Alternatives

N/A

Additional Context

• https://github.com/influxdata/influxdb/pull/25549
• https://github.com/influxdata/influxdb/pull/25572

See also: https://github.com/influxdata/influxdb/pull/25566#discussion_r1853734756