Fix ee extension relying BaseCommand being a class.

Rather than inherit, which we can't anymore Helm::BaseCommand is now
a module, include it and adjust the `initialize` methods for the classes

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

@@ -3,7 +3,15 @@ require_dependency 'gitlab/kubernetes/helm.rb'
 module Gitlab
   module Kubernetes
     module Helm
-      class GetCommand < BaseCommand
+      class GetCommand
+        include BaseCommand
+
+        attr_reader :name
+
+        def initialize(name)
+          @name = name
+        end
+
         def config_map?
           true
         end

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

@@ -3,11 +3,13 @@ require_dependency 'gitlab/kubernetes/helm.rb'
 module Gitlab
   module Kubernetes
     module Helm
-      class UpgradeCommand < BaseCommand
-        attr_reader :chart, :version, :repository, :values
+      class UpgradeCommand
+        include BaseCommand
+
+        attr_reader :name, :chart, :version, :repository, :values
 
         def initialize(name, chart:, values:, version: nil, repository: nil)
-          super(name)
+          @name = name
           @chart = chart
           @version = version
           @values = values