Prepare admin/projects/show view to allow EE specific feature

In EE it will render a Geo Status widget when Geo is enabled and it is
in a secondary node.

Also added minimal specs to that action.

app/views/admin/projects/show.html.haml

@@ -112,6 +112,8 @@
               = visibility_level_icon(@project.visibility_level)
               = visibility_level_label(@project.visibility_level)
 
+    = render_if_exists 'admin/projects/geo_status_widget', locals: { project: @project }
+
     .card
       .card-header
         Transfer project

spec/controllers/admin/projects_controller_spec.rb

@@ -42,4 +42,15 @@ describe Admin::ProjectsController do
       expect { get :index }.not_to exceed_query_limit(control_count)
     end
   end
+
+  describe 'GET /projects/:id' do
+    render_views
+
+    it 'renders show page' do
+      get :show, namespace_id: project.namespace.path, id: project.path
+
+      expect(response).to have_gitlab_http_status(200)
+      expect(response.body).to match(project.name)
+    end
+  end
 end