Rename user_can_admin? because it's more accurate

Also fix the test because we no longer have :empty_project,
just use :project is the same as before

app/services/auth/container_registry_authentication_service.rb

@@ -104,7 +104,7 @@ module Auth
       when 'push'
         build_can_push?(requested_project) || user_can_push?(requested_project)
       when '*'
-        user_can_delete?(requested_project)
+        user_can_admin?(requested_project)
       else
         false
       end
@@ -122,7 +122,7 @@ module Auth
         (requested_project == project || can?(current_user, :build_read_container_image, requested_project))
     end
 
-    def user_can_delete?(requested_project)
+    def user_can_admin?(requested_project)
       has_authentication_ability?(:admin_container_image) &&
         can?(current_user, :admin_container_image, requested_project)
     end

spec/services/auth/container_registry_authentication_service_spec.rb

@@ -315,7 +315,7 @@ describe Auth::ContainerRegistryAuthenticationService do
   end
 
   context 'delete authorized as master' do
-    let(:current_project) { create(:empty_project) }
+    let(:current_project) { create(:project) }
     let(:current_user) { create(:user) }
 
     let(:authentication_abilities) do