Cloud Connector status: update copy

What does this MR do and why?

This updates message copy for the Cloud Connector admin health check.

This feature is still behind the cloud_connector_status FF. Not user-facing currently.

See #475040 (closed)

MR acceptance checklist

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How to set up and validate locally

Numbered steps to set up and validate the change are strongly suggested.

Related to #475040 (closed)