Remove feature flag in Dependency List entry point

Part of [Clean up dependency_list_ui feature flag and old code
paths][1].

[1]: https://gitlab.com/gitlab-org/gitlab/-/issues/212867

ee/app/assets/javascripts/dependencies/index.js

 import Vue from 'vue';
 import DependenciesApp from './components/app.vue';
 import createStore from './store';
-import { DEPENDENCY_LIST_TYPES } from './store/constants';
-import { addListType } from './store/utils';
 
 export default () => {
   const el = document.querySelector('#js-dependencies-app');
@@ -10,10 +8,6 @@ export default () => {
 
   const store = createStore();
 
-  if (!gon.features?.dependencyListUi) {
-    addListType(store, DEPENDENCY_LIST_TYPES.vulnerable);
-  }
-
   return new Vue({
     el,
     store,

ee/app/assets/javascripts/dependencies/store/constants.js

@@ -10,6 +10,8 @@ export const DEPENDENCY_LIST_TYPES = {
       filter: FILTER.all,
     },
   },
+  // This is only used in tests, and will be removed in
+  // https://gitlab.com/gitlab-org/gitlab/-/issues/217734
   vulnerable: {
     namespace: 'vulnerableDependencies',
     label: s__('Dependencies|Vulnerable components'),

ee/app/controllers/projects/dependencies_controller.rb

@@ -4,10 +4,6 @@ module Projects
   class DependenciesController < Projects::ApplicationController
     before_action :authorize_read_dependency_list!
 
-    before_action only: [:index] do
-      push_frontend_feature_flag(:dependency_list_ui, project, default_enabled: true)
-    end
-
     def index
       respond_to do |format|
         format.html do