Merge branch 'return-entity-type-for-project-autocomplete-sources-members' into 'master'

EE Add a type property to project autocomplete members

See merge request gitlab-org/gitlab-ee!9576

ee/spec/services/groups/participants_service_spec.rb

@@ -11,6 +11,7 @@ describe Groups::ParticipantsService do
 
   def user_to_autocompletable(user)
     {
+      type: user.class.name,
       username: user.username,
       name: user.name,
       avatar_url: user.avatar_url