The PR partially implements madr-52 and allows applying policies on the custom namespace.

Based on how policy looks Kuma CP adds a new label:

kuma.io/policy-role: producer | consumer | workload-owner | system

Producer policies are not supported at this moment, because we can't reference MeshService in to[].targetRef.kind.

Checklist prior to review

• Link to relevant issue as well as docs and UI issues -- Fix Add ability to apply policies on the custom namespaces #10163
• This will not break child repos: it doesn't hardcode values (.e.g "kumahq" as a image registry) and it will work on Windows, system specific functions like syscall.Mkfifo have equivalent implementation on the other OS --
• Tests (Unit test, E2E tests, manual test on universal and k8s) --
  • Don't forget ci/ labels to run additional/fewer tests
• Do you need to update UPGRADE.md? --
• Does it need to be backported according to the backporting policy? (this GH action will add "backport" label based on these file globs, if you want to prevent it from adding the "backport" label use no-backport-autolabel label) --