[CI] Test vCluster for review environment isolation

Summary

Virtual clusters may be worth exploring, such as those provided by https://github.com/loft-sh/vcluster. CRD isolation would be especially helpful for Operator testing.

Acceptance criteria

• Feature branch is created that uses vCluster for jobs related to review environments
• Deployments to vCluster are compared to existing cloud environments including deploy time, required changes, and stability