Convert clusters to use a top-level controller

In preparation so that we can create both cluster attached to project
and cluster attached to group.

- Move ClustersController to top level

- Move Clusters::ApplicationsController to top-level too

- Creates a Clusters::BaseController to share common functions

- Do not rely on @project ivar. Anything could set the ivar.

- Fix Vue page components due to new data-page value

Because of the controller change we have gone from
`projects:clusters:new` to `clusters:new`, so we need to update the file
location of the page components. There is somewhere a function that will
convert data-page to a file location.

On that note, projects/clusters/gcp/new/, translate to
Projects::Clusters::Gcp#new doesn't exist so replace that with
clusters/create_gcp/ and clusters/create_user/

2 files changed, 18 insertions, 14 deletions

diff --git a/config/routes.rb b/config/routes.rb
index 37c7f98ec98..cfb81cabfe4 100644
--- a/config/routes.rb
+++ b/config/routes.rb
@@ -84,6 +84,23 @@ Rails.application.routes.draw do
     draw :instance_statistics
   end
 
+  concern :clusterable do
+    resources :clusters, except: [:edit, :create], controller: '/clusters' do
+      collection do
+        post :create_gcp
+        post :create_user
+      end
+
+      member do
+        get :status, format: :json
+
+        scope :applications do
+          post '/:application', to: '/clusters/applications#create', as: :install_applications
+        end
+      end
+    end
+  end
+
   draw :api
   draw :sidekiq
   draw :help
diff --git a/config/routes/project.rb b/config/routes/project.rb
index 73c46f72168..387d2363552 100644
--- a/config/routes/project.rb
+++ b/config/routes/project.rb
@@ -206,20 +206,7 @@ constraints(::Constraints::ProjectUrlConstrainer.new) do
         end
       end
 
-      resources :clusters, except: [:edit, :create] do
-        collection do
-          post :create_gcp
-          post :create_user
-        end
-
-        member do
-          get :status, format: :json
-
-          scope :applications do
-            post '/:application', to: 'clusters/applications#create', as: :install_applications
-          end
-        end
-      end
+      concerns :clusterable
 
       resources :environments, except: [:destroy] do
         member do