Resolve CE/EE diffs in _flash_messages

Part of single codebase changes.

app/views/projects/_flash_messages.html.haml

@@ -8,5 +8,4 @@
     = render 'shared/shared_runners_minutes_limit', project: project
     - unless project.empty_repo?
       = render 'shared/auto_devops_implicitly_enabled_banner', project: project
-    - if project.above_size_limit?
-      = render 'above_size_limit_warning'
+    = render_if_exists 'projects/above_size_limit_warning', project: project

ee/app/views/projects/_above_size_limit_warning.html.haml

-.alert.alert-warning.d-none.d-sm-block
-  = project_above_size_limit_message
+- if project.above_size_limit?
+  .alert.alert-warning.d-none.d-sm-block
+    = project_above_size_limit_message

ee/spec/controllers/projects_controller_spec.rb

@@ -9,6 +9,27 @@ describe ProjectsController do
     sign_in(user)
   end
 
+  describe "GET show" do
+    let(:public_project) { create(:project, :public, :repository) }
+
+    render_views
+
+    it 'shows the over size limit warning message if above_size_limit' do
+      allow_any_instance_of(EE::Project).to receive(:above_size_limit?).and_return(true)
+      allow(controller).to receive(:current_user).and_return(user)
+
+      get :show, params: { namespace_id: public_project.namespace.path, id: public_project.path }
+
+      expect(response.body).to match(/The size of this repository.+exceeds the limit/)
+    end
+
+    it 'does not show an over size warning if not above_size_limit' do
+      get :show, params: { namespace_id: public_project.namespace.path, id: public_project.path }
+
+      expect(response.body).not_to match(/The size of this repository.+exceeds the limit/)
+    end
+  end
+
   describe 'POST create' do
     let!(:params) do
       {

spec/controllers/projects_controller_spec.rb

@@ -237,29 +237,6 @@ describe ProjectsController do
         get :show, params: { namespace_id: public_project.namespace, id: public_project }
         expect(response).to render_template('_readme')
       end
-
-      context 'project repo over limit' do
-        before do
-          allow_any_instance_of(EE::Project)
-            .to receive(:above_size_limit?).and_return(true)
-
-          project.add_maintainer(user)
-        end
-
-        it 'shows the over size limit warning message for project members' do
-          allow(controller).to receive(:current_user).and_return(user)
-
-          get :show, params: { namespace_id: public_project.namespace.path, id: public_project.path }
-
-          expect(response).to render_template('_above_size_limit_warning')
-        end
-
-        it 'does not show the message for non members' do
-          get :show, params: { namespace_id: public_project.namespace.path, id: public_project.path }
-
-          expect(response).not_to render_template('_above_size_limit_warning')
-        end
-      end
     end
 
     context "when the url contains .atom" do