Gatekeeper warning to let developers set PDBs that lets kured reboot the nodes.

[Pavan-Gunda]

Description

Write a gatekeeper policy and warn the developer, preferably by pointing to kured docs and mention what it does and why it requires the deployment to have PDBs that lets kured safely drain nodes

Additional context

No response

Definition of done

• We have a gatekeeper policy

[Ajarmar]

Closed by #2459