Add cta grpc frontend to k8s setup

Problem to solve

Be able to create a working cta-frontend-grpc in CI for testing purposes. We are not able to easily do system tests on changes that affect both frontends, i.e. #698 (closed) or #573 (closed)

Stakeholders

• CTA Team

Proposal

Implement a new feature to be able to create a grpc frontend on demand to the k8s setup.