KAFKA-15821: Delete active topics after connector deletion in standal…

[djameson42]

Fixes a bug where the active topics for a connector are not removed when the connector is deleted if connect is running in standalone mode.

https://issues.apache.org/jira/browse/KAFKA-15821

[C0urante]

Thanks for the PR @djameson42! I agree with @hudeqi that we should have a test to cover this change and prevent regression.

Also, not a blocker, but it seems a little strange to put this new logic in the config update listener instead of in StandaloneHerder::deleteConnectorConfig, which is where almost all of the existing connector deletion logic is located. Any particular reason you've structured things this way?

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