Use a helper to inject data into epic form

ee/app/helpers/epics_helper.rb

@@ -5,6 +5,17 @@ module EpicsHelper
     EpicPresenter.new(epic, current_user: current_user).show_data(author_icon: avatar_icon_for_user(epic.author), base_data: issuable_initial_data(epic))
   end
 
+  def epic_new_app_data(group)
+    {
+      group_path: group.full_path,
+      group_epics_path: group_epics_path(group),
+      labels_fetch_path: group_labels_path(group, format: :json, only_group_labels: true, include_ancestor_groups: true),
+      labels_manage_path: group_labels_path(group),
+      markdown_preview_path: preview_markdown_path(group),
+      markdown_docs_path: help_page_path('user/markdown')
+    }
+  end
+
   def epic_endpoint_query_params(opts)
     opts[:data] ||= {}
     opts[:data][:endpoint_query_params] = {

ee/app/views/groups/epics/new.html.haml

@@ -2,4 +2,4 @@
 - breadcrumb_title _("New")
 - page_title _("New epic")
 
-.js-epic-new{ data: { group_path: @group.full_path, group_epics_path: group_epics_path(@group), labels_fetch_path: group_labels_path(@group, format: :json, only_group_labels: true, include_ancestor_groups: true), labels_manage_path: group_labels_path(@group), markdown_preview_path: preview_markdown_path(@group), markdown_docs_path: help_page_path('user/markdown') } }
+.js-epic-new{ data: epic_new_app_data(@group) }