Add feature flag to TriggerFields

- Remove field[:type] == fieldset because it's no
longer used (there are no instances of it defined in services.

app/assets/javascripts/integrations/edit/components/integration_form.vue

@@ -45,6 +45,6 @@ export default {
   <div>
     <active-toggle v-if="showActive" v-bind="activeToggleProps" />
     <jira-trigger-fields v-if="isJira" v-bind="triggerFieldsProps" />
-    <trigger-fields v-else :events="triggerEvents" :type="type" />
+    <trigger-fields v-else-if="triggerEvents.length" :events="triggerEvents" :type="type" />
   </div>
 </template>

app/views/shared/_service_settings.html.haml

@@ -9,7 +9,7 @@
 
 .service-settings
   .js-vue-integration-settings{ data: { show_active: @service.show_active_box?.to_s, activated: (@service.active || @service.new_record?).to_s, type: @service.to_param, merge_request_events: @service.merge_requests_events.to_s,
-commit_events: @service.commit_events.to_s, enable_comments: @service.comment_on_event_enabled.to_s, comment_detail: @service.comment_detail, trigger_events: @service.configurable_events_json } }
+commit_events: @service.commit_events.to_s, enable_comments: @service.comment_on_event_enabled.to_s, comment_detail: @service.comment_detail, trigger_events: Feature.enabled?(:integration_form_refactor) ? @service.configurable_events_json : [] } }
 
   - if @service.configurable_events.present? && !@service.is_a?(JiraService)
     .form-group.row
@@ -33,15 +33,4 @@ commit_events: @service.commit_events.to_s, enable_comments: @service.comment_on
               = @service.class.event_description(event)
 
   - @service.global_fields.each do |field|
-    - type = field[:type]
-
-    - if type == 'fieldset'
-      - fields = field[:fields]
-      - legend = field[:legend]
-
-      %fieldset
-        %legend= legend
-        - fields.each do |subfield|
-          = render 'shared/field', form: form, field: subfield
-    - else
-      = render 'shared/field', form: form, field: field
+    = render 'shared/field', form: form, field: field