Default-enable Cloud Connector status FF

What does this MR do and why?

This enables the cloud_connector_status feature flag by default for 17.3. This flag guards a GraphQL admin API and the related frontend code.

We decided to only roll this out for self-managed/Dedicated at this point in time.

I also decided not to remove the FF yet to reduce the likelihood of merge conflicts with ongoing changes to the UI since this feature is still WIP and should land before end of this week in time for Duo Enterprise.

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Related to #473706 (closed)