Fix Rails/SaveBang offenses for profile & projects controllers

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

.rubocop_manual_todo.yml

@@ -178,9 +178,6 @@ Rails/SaveBang:
     - 'spec/controllers/groups/runners_controller_spec.rb'
     - 'spec/controllers/groups/uploads_controller_spec.rb'
     - 'spec/controllers/groups_controller_spec.rb'
-    - 'spec/controllers/profiles/emails_controller_spec.rb'
-    - 'spec/controllers/profiles/notifications_controller_spec.rb'
-    - 'spec/controllers/projects_controller_spec.rb'
     - 'spec/controllers/sent_notifications_controller_spec.rb'
     - 'spec/controllers/sessions_controller_spec.rb'
     - 'spec/factories_spec.rb'

spec/controllers/profiles/notifications_controller_spec.rb

@@ -5,8 +5,8 @@ require 'spec_helper'
 RSpec.describe Profiles::NotificationsController do
   let(:user) do
     create(:user) do |user|
-      user.emails.create(email: 'original@example.com', confirmed_at: Time.current)
-      user.emails.create(email: 'new@example.com', confirmed_at: Time.current)
+      user.emails.create!(email: 'original@example.com', confirmed_at: Time.current)
+      user.emails.create!(email: 'new@example.com', confirmed_at: Time.current)
       user.notification_email = 'original@example.com'
       user.save!
     end

spec/controllers/projects_controller_spec.rb

@@ -159,7 +159,7 @@ RSpec.describe ProjectsController do
           before do
             setting = user.notification_settings_for(public_project)
             setting.level = :watch
-            setting.save
+            setting.save!
           end
 
           it "shows current notification setting" do
@@ -237,7 +237,7 @@ RSpec.describe ProjectsController do
       User.project_views.keys.each do |project_view|
         context "with #{project_view} view set" do
           before do
-            user.update(project_view: project_view)
+            user.update!(project_view: project_view)
 
             get :show, params: { namespace_id: empty_project.namespace, id: empty_project }
           end
@@ -260,7 +260,7 @@ RSpec.describe ProjectsController do
       User.project_views.keys.each do |project_view|
         context "with #{project_view} view set" do
           before do
-            user.update(project_view: project_view)
+            user.update!(project_view: project_view)
 
             get :show, params: { namespace_id: empty_project.namespace, id: empty_project }
           end