Extensions: Add hooks to support virtual clusters #11064
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Summary
Fixes #11065
This PR adds several hooks for virtual cluster support.
The changes extend the provisioner helper and allow the cluster list to be grouped by host cluster when there are virtual clusters present.
Changes made in a way to be as least disruptive as possible.
We will refine these extension points in the future and document once stable.
Areas or cases that should be tested
These hooks will be tested by extensions.
Current e2e test should validate that the hooks do not break existing functionality.
Checklist