Migrate extension-managed local (Docker-based) resources to use `DIRECT` connection type

We're currently using the `LOCAL` connection type, but we should switch to the `DIRECT` connection type (and continue using a static connection ID).

This will also require passing the new `kafka_cluster_config` and `schema_registry_config` objects and updating them when new resources are started, as we dynamically assign ports: https://github.com/confluentinc/ide-sidecar/blob/36d9bf4fbcca74eeff1093416488263e59cfee32/src/generated/resources/openapi.yaml#L574-L584