Remove references to createEpicForm feature flag

This feature flag was used to ship the feature
incrementally, so there is no use case for it
after deployment.

Related issue:
https://gitlab.com/gitlab-org/gitlab/-/issues/230742

ee/app/assets/javascripts/epic/components/epic_header.vue

@@ -7,7 +7,6 @@ import { __ } from '~/locale';
 import tooltip from '~/vue_shared/directives/tooltip';
 import UserAvatarLink from '~/vue_shared/components/user_avatar/user_avatar_link.vue';
 import TimeagoTooltip from '~/vue_shared/components/time_ago_tooltip.vue';
-import glFeatureFlagsMixin from '~/vue_shared/mixins/gl_feature_flags_mixin';
 
 import epicUtils from '../utils/epic_utils';
 import { statusType } from '../constants';
@@ -24,7 +23,6 @@ export default {
     GitlabTeamMemberBadge: () =>
       import('ee_component/vue_shared/components/user_avatar/badges/gitlab_team_member_badge.vue'),
   },
-  mixins: [glFeatureFlagsMixin()],
   computed: {
     ...mapState([
       'sidebarCollapsed',
@@ -50,9 +48,6 @@ export default {
     actionButtonText() {
       return this.isEpicOpen ? __('Close epic') : __('Reopen epic');
     },
-    userCanCreate() {
-      return this.canCreate && this.glFeatures.createEpicForm;
-    },
   },
   mounted() {
     /**
@@ -141,7 +136,7 @@ export default {
         {{ actionButtonText }}
       </gl-button>
       <gl-button
-        v-if="userCanCreate"
+        v-if="canCreate"
         :href="newEpicWebUrl"
         category="secondary"
         variant="success"

ee/app/controllers/groups/epics_controller.rb

@@ -19,7 +19,6 @@ class Groups::EpicsController < Groups::ApplicationController
   before_action do
     push_frontend_feature_flag(:vue_issuable_epic_sidebar, @group)
     push_frontend_feature_flag(:confidential_epics, @group, default_enabled: true)
-    push_frontend_feature_flag(:create_epic_form, @group, default_enabled: true)
   end
 
   def new; end

ee/app/views/layouts/header/_create_epic_new_dropdown_item.haml

-- create_group_epic = can?(current_user, :create_epic, @group)
-- return unless create_group_epic && Feature.enabled?(:create_epic_form)
+- return unless can?(current_user, :create_epic, @group)
 
 %li= link_to _('New epic'), new_group_epic_path(@group)

ee/spec/frontend/epic/components/epic_header_spec.js

@@ -12,7 +12,6 @@ import { mockEpicMeta, mockEpicData } from '../mock_data';
 describe('EpicHeaderComponent', () => {
   let wrapper;
   let store;
-  let features = {};
 
   beforeEach(() => {
     store = createStore();
@@ -21,9 +20,6 @@ describe('EpicHeaderComponent', () => {
 
     wrapper = shallowMount(EpicHeader, {
       store,
-      provide: {
-        glFeatures: features,
-      },
     });
   });
 
@@ -169,29 +165,19 @@ describe('EpicHeaderComponent', () => {
       });
     });
 
-    it('does not render new epic button without `createEpicForm` feature flag', () => {
-      expect(findNewEpicButton().exists()).toBeFalsy();
-    });
+    it('does not render new epic button if user cannot create it', () => {
+      store.state.canCreate = false;
 
-    describe('with `createEpicForm` feature flag', () => {
-      beforeAll(() => {
-        features = { createEpicForm: true };
-      });
-
-      it('does not render new epic button if user cannot create it', () => {
-        store.state.canCreate = false;
-
-        return wrapper.vm.$nextTick().then(() => {
-          expect(findNewEpicButton().exists()).toBe(false);
-        });
+      return wrapper.vm.$nextTick().then(() => {
+        expect(findNewEpicButton().exists()).toBe(false);
       });
+    });
 
-      it('renders new epic button if user can create it', () => {
-        store.state.canCreate = true;
+    it('renders new epic button if user can create it', () => {
+      store.state.canCreate = true;
 
-        return wrapper.vm.$nextTick().then(() => {
-          expect(findNewEpicButton().exists()).toBe(true);
-        });
+      return wrapper.vm.$nextTick().then(() => {
+        expect(findNewEpicButton().exists()).toBe(true);
       });
     });
   });

ee/spec/views/layouts/header/_new_dropdown.haml_spec.rb

@@ -41,21 +41,6 @@ RSpec.describe 'layouts/header/_new_dropdown' do
             href: new_group_epic_path(group)
           )
         end
-
-        context 'with the create_epic_form feature flag disabled' do
-          before do
-            stub_feature_flags(create_epic_form: false)
-          end
-
-          it 'does not have "New epic" link' do
-            render
-
-            expect(rendered).not_to have_link(
-              'New epic',
-              href: new_group_epic_path(group)
-            )
-          end
-        end
       end
     end
   end