Open an Enhancement PR (openshift/enhancements) for the Own/SingleNamespace InstallMode feature

See dev guide for more information: https://docs.google.com/document/d/1krN-4vwaE47aLRW9QjwD374-0Sh80taa_7goqVNi_-s/edit?tab=t.0#heading=h.nm6xjjfqiyl 

AC:

• Open and shepherd an openshift enhancement PR for this feature
• Connect with Docs team to discuss docs impacts of feature gate: https://docs.google.com/document/d/1krN-4vwaE47aLRW9QjwD374-0Sh80taa_7goqVNi_-s/edit?tab=t.0#heading=h.ioxk20ge3nlf 
• Update the dev guide to add more details to the process if needed