Policy Assistant GH action is not required and doesn't run for external contributors

[huntergregory]

Looks like we need to require Policy assistant GH action in the repository settings? But it seems like a repository owner also has to authorize a GH action run for a non kubernetes member? My approvals as policy assistant owner did not authorize.

Not required:

Example external contributor requiring authorization:

https://github.com/kubernetes-sigs/network-policy-api/actions/runs/11772321836