Enable the kubernetes agent internal api by default

Merged Thong Kuah requested to merge ff-kubernetes_agent_internal_api into master

What does this MR do?

Enable the kubernetes agent internal api by default (:kubernetes_agent_internal_api flag)

Since we now have the JWT internal auth since bf5b5cf9, we don't need the protection of FF anymore. However we still keep the FF so that we can disable this if necessary (e.g. for performance reasons).

Does this MR meet the acceptance criteria?

Conformity

Availability and Testing

Edited by Thong Kuah