Move Gcp::Kubernetes* services outside GCP namespace
We have 3 classes under Clusters::Gcp::Kubernetes:
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Clusters::Gcp::Kubernetes::CreateOrUpdateNamespaceService(after https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/22011) Clusters::Gcp::Kubernetes::CreateServiceAccountServiceClusters::Gcp::Kubernetes::FetchKubernetesTokenService
But this services should apply for all Kubernetes clusters, not just the ones for GCP. We should move them to a different namespace/folder, maybe Clusters::Kubernetes?