Merge branch '7027-unable-to-load-kubernetes-helm' into 'master'

Resolve "Unable to load 'lib/gitlab/kubernetes/helm'"

Closes #7027

See merge request gitlab-org/gitlab-ee!6683

ee/lib/gitlab/kubernetes/helm/get_command.rb

-require_dependency 'lib/gitlab/kubernetes/helm.rb'
+require_dependency 'gitlab/kubernetes/helm.rb'
 
 module Gitlab
   module Kubernetes

ee/lib/gitlab/kubernetes/helm/upgrade_command.rb

-require_dependency 'lib/gitlab/kubernetes/helm.rb'
+require_dependency 'gitlab/kubernetes/helm.rb'
 
 module Gitlab
   module Kubernetes