KC: Impl Connect cluster overview

[fallen-up]

Issue submitter TODO list

• I've searched for an already existing issues here
• I'm running a supported version of the application which is listed here and the feature is not present there

Is your proposal related to a problem?

No response

Describe the feature you're interested in

now when you click Kafka Connect, the list of connectors opens immediately (xxx/ui/clusters/cluster-name/connectors).
it would be great to implement an overview of all kafka-connects as it is done on the main dashboard page for all kafka clusters.
and how it's done in redpanda-console.

Describe alternatives you've considered

No response

Version you're running

1.0.0

Additional context

No response