update ownership handling for consistency

[grokspawn]

Currently, OWNERS* files are ignored because the repo does not have a prow instance governing it. (Instead, authentication falls back on github groups.)

We should integrate with prow-github-actions to support authentication via the established OWNERS* files.

[jberkhahn]

This is something we had looked into in the past, but it was a large amount of work. This is also something that would probably need to be done at the org level and shared between the various OF subprojects?