Refactor unauthorized_user_project helper

Move helper to packages/basic_auth_helpers
and refactor so find_project() is called
only once.

ee/lib/api/helpers/packages/basic_auth_helpers.rb

@@ -15,12 +15,20 @@ module API
           find_personal_access_token_from_http_basic_auth
         end
 
+        def unauthorized_user_project
+          @unauthorized_user_project ||= find_project(params[:id])
+        end
+
+        def unauthorized_user_project!
+          unauthorized_user_project || not_found!
+        end
+
         def authorized_user_project
-          @authorized_user_project ||= authorized_project_find!(params[:id])
+          @authorized_user_project ||= authorized_project_find!
         end
 
-        def authorized_project_find!(id)
-          project = find_project(id)
+        def authorized_project_find!
+          project = unauthorized_user_project
 
           unless project && can?(current_user, :read_project, project)
             return unauthorized_or! { not_found! }

ee/lib/api/pypi_packages.rb

@@ -43,10 +43,6 @@ module API
 
         packages
       end
-
-      def unauthorized_user_project
-        @unauthorized_user_project ||= find_project(params[:id]) || not_found!
-      end
     end
 
     before do
@@ -59,7 +55,7 @@ module API
 
     resource :projects, requirements: API::NAMESPACE_OR_PROJECT_REQUIREMENTS do
       before do
-        authorize_packages_feature!(unauthorized_user_project)
+        authorize_packages_feature!(unauthorized_user_project!)
       end
 
       namespace ':id/packages/pypi' do
@@ -73,7 +69,7 @@ module API
         end
 
         get 'files/:sha256/*file_identifier' do
-          project = unauthorized_user_project
+          project = unauthorized_user_project!
 
           filename = "#{params[:file_identifier]}.#{params[:format]}"
           package = packages_finder(project).by_file_name_and_sha256(filename, params[:sha256])