Remove unused spec support BackgroundJobs (#4464) [ci skip]

spec/models/notification_spec.rb

@@ -90,13 +90,13 @@ RSpec.describe Notification, type: :model do
     let(:tag_follow) { user.follow(tag) }
 
     it "runs fine" do
-      run_background_jobs_immediately do
+      perform_enqueued_jobs do
         described_class.send_new_follower_notification(tag_follow)
       end
     end
 
     it "doesn't create a notification" do
-      run_background_jobs_immediately do
+      perform_enqueued_jobs do
         expect do
           described_class.send_new_follower_notification(tag_follow)
         end.not_to change(described_class, :count)

spec/observers/comment_observer_spec.rb

@@ -12,7 +12,7 @@ RSpec.describe CommentObserver, type: :observer do
     perform_enqueued_jobs do
       user.add_role :warned
       Comment.observers.enable :comment_observer do
-        run_background_jobs_immediately do
+        perform_enqueued_jobs do
           create(:comment, user: user, commentable: article)
         end
       end

spec/support/background_jobs.rb

@@ -1,11 +0,0 @@
-module BackgroundJobs
-  def run_background_jobs_immediately
-    Delayed::Worker.delay_jobs = false
-    yield
-    Delayed::Worker.delay_jobs = true
-  end
-end
-
-RSpec.configure do |config|
-  config.include BackgroundJobs
-end