Implement notify parameter for WP PATCH endpoint

lib/api/v3/work_packages/work_packages_api.rb

@@ -40,6 +40,14 @@ module API
             helpers do
               attr_reader :work_package
 
+              def save_work_package
+                send_notifications = !(params.has_key?(:notify) && params[:notify] == 'false')
+
+                UserMailer.with_deliveries(send_notifications) do
+                  @representer.represented.save
+                end
+              end
+
               def decorate_work_package(work_package)
                 @representer = ::API::V3::WorkPackages::WorkPackageRepresenter.new(work_package, { current_user: current_user }, :activities, :users)
               end
@@ -81,7 +89,7 @@ module API
 
               @representer.from_json(patch_request_body)
 
-              if patch_request_valid? && @representer.represented.save
+              if patch_request_valid? && save_work_package
                 decorate_work_package(@work_package.reload)
                 @representer
               else