Remove metricsDashboardNewPanelPage from FE component

This commit removes the metricsDashboardNewPanelPage feature flag
from the frontend so the button is displayed to all users.

app/assets/javascripts/monitoring/components/dashboard_actions_menu.vue

@@ -11,7 +11,6 @@ import {
   GlTooltipDirective,
 } from '@gitlab/ui';
 import CustomMetricsFormFields from '~/custom_metrics/components/custom_metrics_form_fields.vue';
-import glFeatureFlagsMixin from '~/vue_shared/mixins/gl_feature_flags_mixin';
 import { PANEL_NEW_PAGE } from '../router/constants';
 import DuplicateDashboardModal from './duplicate_dashboard_modal.vue';
 import CreateDashboardModal from './create_dashboard_modal.vue';
@@ -38,7 +37,6 @@ export default {
     GlTooltip: GlTooltipDirective,
     TrackEvent: TrackEventDirective,
   },
-  mixins: [glFeatureFlagsMixin()],
   props: {
     addingMetricsAvailable: {
       type: Boolean,
@@ -86,7 +84,6 @@ export default {
     },
     isMenuItemShown() {
       return {
-        addPanel: this.glFeatures.metricsDashboardNewPanelPage,
         duplicateDashboard: this.isOutOfTheBoxDashboard,
       };
     },
@@ -192,7 +189,6 @@ export default {
       </gl-modal>
     </template>
 
-    <template v-if="isMenuItemShown.addPanel">
     <gl-new-dropdown-item
       v-if="isMenuItemEnabled.addPanel"
       data-testid="add-panel-item-enabled"
@@ -216,7 +212,6 @@ export default {
         <span class="gl-text-gray-400">{{ $options.i18n.addPanel }}</span>
       </gl-new-dropdown-item>
     </div>
-    </template>
 
     <gl-new-dropdown-item
       v-if="isMenuItemEnabled.editDashboard"

spec/frontend/monitoring/components/dashboard_actions_menu_spec.js

@@ -42,9 +42,6 @@ describe('Actions menu', () => {
   const createShallowWrapper = (props = {}, options = {}) => {
     wrapper = shallowMount(ActionsMenu, {
       propsData: { ...dashboardActionsMenuProps, ...props },
-      provide: {
-        glFeatures: { metricsDashboardNewPanelPage: true },
-      },
       store,
       ...options,
     });