Enable autocomplete on cadence iteration create/edit pages

Changelog: added
EE: true

ee/app/controllers/concerns/iteration_cadences_actions.rb

@@ -6,6 +6,7 @@ module IterationCadencesActions
   included do
     before_action :check_cadences_available!
     before_action :authorize_show_cadence!, only: [:index]
+    before_action :set_noteable_type, only: [:index]
 
     feature_category :team_planning
   end
@@ -21,4 +22,8 @@ module IterationCadencesActions
   def authorize_show_cadence!
     render_404 unless can?(current_user, :read_iteration_cadence, group)
   end
+
+  def set_noteable_type
+    @noteable_type = Iteration # rubocop:disable Gitlab/ModuleWithInstanceVariables
+  end
 end

ee/app/views/groups/iteration_cadences/index.html.haml

+- @gfm_form = true
 - page_title s_('Iterations|Iteration cadences')
 
 .js-iteration-cadence-app{ data: { full_path: @group.full_path,

ee/app/views/projects/iteration_cadences/index.html.haml

+- @gfm_form = true
 - page_title s_('Iterations|Iteration cadences')
 
 .js-iteration-cadence-app{ data: { full_path: @project.full_path,