fix ratelimit namespace and handle deletion of rl policy

[eguzki]

• Limitador RateLimit CRs created in the namespace of the limitador service instead of the RateLimitPolicy namespace.

The limitador operator applies rate limit CR configuration on the limitador service running in the same namespace of the CR

• Delete RateLimit CRs when RateLimitPolicy is deleted

Verification steps

1. make local-setup
2. Deploy toystore ratelimitpolicy in default namespace k apply -f examples/toystore

The kuadrant controller should have created ratelimit objects in the same namespace as the limitador service, i.e. kuadrant-system

$ k get ratelimits -A
NAMESPACE         NAME                 AGE
kuadrant-system   default-toystore-1   7s
kuadrant-system   default-toystore-2   7s

3. Remove the rate limit policy

   k delete ratelimitpolicy toystore

   Check that ratelimit CRs are also deleted

$ k get ratelimits -A
No resources found.