Fix Rails/SaveBang offenses in spec/features/admin

Contributes to https://gitlab.com/gitlab-org/gitlab/-/issues/220040.

.rubocop_manual_todo.yml

@@ -184,13 +184,6 @@ Rails/SaveBang:
     - 'spec/controllers/sent_notifications_controller_spec.rb'
     - 'spec/controllers/sessions_controller_spec.rb'
     - 'spec/factories_spec.rb'
-    - 'spec/features/admin/admin_appearance_spec.rb'
-    - 'spec/features/admin/admin_labels_spec.rb'
-    - 'spec/features/admin/admin_mode/login_spec.rb'
-    - 'spec/features/admin/admin_runners_spec.rb'
-    - 'spec/features/admin/admin_sees_project_statistics_spec.rb'
-    - 'spec/features/admin/admin_sees_projects_statistics_spec.rb'
-    - 'spec/features/admin/admin_users_impersonation_tokens_spec.rb'
     - 'spec/features/dashboard/datetime_on_tooltips_spec.rb'
     - 'spec/features/dashboard/issuables_counter_spec.rb'
     - 'spec/features/dashboard/project_member_activity_index_spec.rb'

spec/features/admin/admin_appearance_spec.rb

@@ -66,7 +66,7 @@ RSpec.describe 'Admin Appearance' do
 
     context 'when system header and footer messages are not empty' do
       before do
-        appearance.update(header_message: 'Foo', footer_message: 'Bar')
+        appearance.update!(header_message: 'Foo', footer_message: 'Bar')
       end
 
       it 'shows custom system header and footer fields' do

spec/features/admin/admin_labels_spec.rb

@@ -3,8 +3,8 @@
 require 'spec_helper'
 
 RSpec.describe 'admin issues labels' do
-  let!(:bug_label) { Label.create(title: 'bug', template: true) }
-  let!(:feature_label) { Label.create(title: 'feature', template: true) }
+  let!(:bug_label) { Label.create!(title: 'bug', template: true) }
+  let!(:feature_label) { Label.create!(title: 'feature', template: true) }
 
   before do
     admin = create(:admin)

spec/features/admin/admin_mode/login_spec.rb

@@ -86,7 +86,7 @@ RSpec.describe 'Admin Mode Login' do
               expect(codes.size).to eq 10
 
               # Ensure the generated codes get saved
-              user.save
+              user.save!
             end
 
             context 'with valid code' do

spec/features/admin/admin_runners_spec.rb

@@ -355,7 +355,7 @@ RSpec.describe "Admin Runners" do
         let(:runner) { create(:ci_runner, :instance) }
 
         before do
-          @project1.destroy
+          @project1.destroy!
           visit admin_runner_path(runner)
         end
 

spec/features/admin/admin_sees_project_statistics_spec.rb

@@ -21,7 +21,7 @@ RSpec.describe "Admin > Admin sees project statistics" do
   end
 
   context 'when project has no statistics' do
-    let(:project) { create(:project, :repository) { |project| project.statistics.destroy } }
+    let(:project) { create(:project, :repository) { |project| project.statistics.destroy! } }
 
     it "shows 'Storage: Unknown'" do
       expect(page).to have_content("Storage: Unknown")

spec/features/admin/admin_sees_projects_statistics_spec.rb

@@ -7,7 +7,7 @@ RSpec.describe "Admin > Admin sees projects statistics" do
 
   before do
     create(:project, :repository)
-    create(:project, :repository) { |project| project.statistics.destroy }
+    create(:project, :repository) { |project| project.statistics.destroy! }
 
     sign_in(current_user)
     gitlab_enable_admin_mode_sign_in(current_user)

spec/features/admin/admin_users_impersonation_tokens_spec.rb

@@ -75,7 +75,7 @@ RSpec.describe 'Admin > Users > Impersonation Tokens', :js do
     end
 
     it "removes expired tokens from 'active' section" do
-      impersonation_token.update(expires_at: 5.days.ago)
+      impersonation_token.update!(expires_at: 5.days.ago)
 
       visit admin_user_impersonation_tokens_path(user_id: user.username)