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* `ClusterExtension`'s `Available` and `Progressing` conditions are equal to the counterparts on the latest installed active revision
* When a new revision is rolling out, mirror its `Progressing` condition to its counterpart on `ClusterExtension` to improve visibility
  and to signal that a transition is in progress
* Adds `.status.activeRevisions` field to the `ClusterExtension` to track the active revisions and mirrors `Available` and `Progressing` conditions for those
  not marked yet as installed

This changes opens up a possibility for an observer to get insights on `ClusterExtension` update process:
* When Reason on `Progressing` condition flips to `RollingOut`, an update is in progress
* More then one revision could be listed under `.status.activeRevisions` during upgrade (installed + those in progress)
* `Available` and `Progressing` conditions of an active, but not yet available revision, are listed under `.status.activeRevisions.conditions`
  so that can be easier to understand update issues

The new behavior is marked as experimental behind Boxcutter feature gate.