Add combined_menu feature flag stubs

- There are no "combined_menu: true" specs
  because the feature has not been developed

ee/spec/features/operations_nav_link_spec.rb

@@ -7,6 +7,8 @@ RSpec.describe 'Operations dropdown navbar EE' do
   let(:project) { create(:project) }
 
   before do
+    stub_feature_flags(combined_menu: false)
+
     project.add_maintainer(user)
     sign_in(user)
 

spec/features/admin/admin_mode/logout_spec.rb

@@ -9,6 +9,8 @@ RSpec.describe 'Admin Mode Logout', :js do
   let(:user) { create(:admin) }
 
   before do
+    stub_feature_flags(combined_menu: false)
+
     gitlab_sign_in(user)
     gitlab_enable_admin_mode_sign_in(user)
     visit admin_root_path

spec/features/admin/admin_mode_spec.rb

@@ -9,6 +9,8 @@ RSpec.describe 'Admin mode' do
   let(:admin) { create(:admin) }
 
   before do
+    stub_feature_flags(combined_menu: false)
+
     stub_env('IN_MEMORY_APPLICATION_SETTINGS', 'false')
   end
 

spec/features/dashboard/active_tab_spec.rb

@@ -4,6 +4,8 @@ require 'spec_helper'
 
 RSpec.describe 'Dashboard Active Tab', :js do
   before do
+    stub_feature_flags(combined_menu: false)
+
     sign_in(create(:user))
   end
 

spec/features/dashboard/group_dashboard_with_external_authorization_service_spec.rb

@@ -8,6 +8,8 @@ RSpec.describe 'The group dashboard' do
   let(:user) { create(:user) }
 
   before do
+    stub_feature_flags(combined_menu: false)
+
     sign_in user
   end
 

spec/features/dashboard/shortcuts_spec.rb

@@ -3,6 +3,10 @@
 require 'spec_helper'
 
 RSpec.describe 'Dashboard shortcuts', :js do
+  before do
+    stub_feature_flags(combined_menu: false)
+  end
+
   context 'logged in' do
     let(:user) { create(:user) }
     let(:project) { create(:project) }

spec/features/frequently_visited_projects_and_groups_spec.rb

@@ -6,6 +6,8 @@ RSpec.describe 'Frequently visited items', :js do
   let_it_be(:user) { create(:user) }
 
   before do
+    stub_feature_flags(combined_menu: false)
+
     sign_in(user)
   end