Include ExpectOffense module in :rubocop specs

This saves us having to manually require the helper when using with
fast_spec_helper.rb

spec/rubocop/cop/filename_length_spec.rb

 # frozen_string_literal: true
 
-require 'spec_helper'
+require 'fast_spec_helper'
 require 'rubocop'
 require 'rubocop/rspec/support'
 require_relative '../../../rubocop/cop/filename_length'
-require_relative '../../support/helpers/expect_offense'
 
-describe RuboCop::Cop::FilenameLength do
+describe RuboCop::Cop::FilenameLength, type: :rubocop do
   subject(:cop) { described_class.new }
 
   it 'does not flag files with names 100 characters long' do

spec/rubocop/cop/performance/ar_count_each_spec.rb

 # frozen_string_literal: true
 
 require 'fast_spec_helper'
-require_relative '../../../support/helpers/expect_offense'
 require_relative '../../../../rubocop/cop/performance/ar_count_each.rb'
 
-describe RuboCop::Cop::Performance::ARCountEach do
+describe RuboCop::Cop::Performance::ARCountEach, type: :rubocop do
   include CopHelper
   include ExpectOffense
 

spec/rubocop/cop/performance/ar_exists_and_present_blank_spec.rb

 # frozen_string_literal: true
 
 require 'fast_spec_helper'
-require_relative '../../../support/helpers/expect_offense'
 require_relative '../../../../rubocop/cop/performance/ar_exists_and_present_blank.rb'
 
-describe RuboCop::Cop::Performance::ARExistsAndPresentBlank do
+describe RuboCop::Cop::Performance::ARExistsAndPresentBlank, type: :rubocop do
   include CopHelper
   include ExpectOffense
 

spec/rubocop/cop/performance/readlines_each_spec.rb

 # frozen_string_literal: true
 
 require 'fast_spec_helper'
-require_relative '../../../support/helpers/expect_offense'
 require_relative '../../../../rubocop/cop/performance/readlines_each'
 
-describe RuboCop::Cop::Performance::ReadlinesEach do
+describe RuboCop::Cop::Performance::ReadlinesEach, type: :rubocop do
   include CopHelper
   include ExpectOffense
 

spec/rubocop/cop/rspec/modify_sidekiq_middleware_spec.rb

@@ -2,10 +2,9 @@
 
 require 'fast_spec_helper'
 require 'rubocop'
-require_relative '../../../support/helpers/expect_offense'
 require_relative '../../../../rubocop/cop/rspec/modify_sidekiq_middleware'
 
-describe RuboCop::Cop::RSpec::ModifySidekiqMiddleware do
+describe RuboCop::Cop::RSpec::ModifySidekiqMiddleware, type: :rubocop do
   include CopHelper
   include ExpectOffense
 

spec/rubocop/cop/scalability/bulk_perform_with_context_spec.rb

@@ -2,10 +2,9 @@
 
 require 'fast_spec_helper'
 require 'rubocop'
-require_relative '../../../support/helpers/expect_offense'
 require_relative '../../../../rubocop/cop/scalability/bulk_perform_with_context'
 
-describe RuboCop::Cop::Scalability::BulkPerformWithContext do
+describe RuboCop::Cop::Scalability::BulkPerformWithContext, type: :rubocop do
   include CopHelper
   include ExpectOffense
 

spec/rubocop/cop/scalability/cron_worker_context_spec.rb

@@ -2,10 +2,9 @@
 
 require 'fast_spec_helper'
 require 'rubocop'
-require_relative '../../../support/helpers/expect_offense'
 require_relative '../../../../rubocop/cop/scalability/cron_worker_context'
 
-describe RuboCop::Cop::Scalability::CronWorkerContext do
+describe RuboCop::Cop::Scalability::CronWorkerContext, type: :rubocop do
   include CopHelper
   include ExpectOffense
 

spec/rubocop/cop/scalability/file_uploads_spec.rb

@@ -2,10 +2,9 @@
 
 require 'fast_spec_helper'
 require 'rubocop'
-require_relative '../../../support/helpers/expect_offense'
 require_relative '../../../../rubocop/cop/scalability/file_uploads'
 
-describe RuboCop::Cop::Scalability::FileUploads do
+describe RuboCop::Cop::Scalability::FileUploads, type: :rubocop do
   include CopHelper
   include ExpectOffense
 

spec/rubocop/cop/scalability/idempotent_worker_spec.rb

@@ -2,10 +2,9 @@
 
 require 'fast_spec_helper'
 require 'rubocop'
-require_relative '../../../support/helpers/expect_offense'
 require_relative '../../../../rubocop/cop/scalability/idempotent_worker'
 
-describe RuboCop::Cop::Scalability::IdempotentWorker do
+describe RuboCop::Cop::Scalability::IdempotentWorker, type: :rubocop do
   include CopHelper
   include ExpectOffense
 

spec/support/rspec.rb

@@ -4,6 +4,7 @@ require_relative "helpers/stub_configuration"
 require_relative "helpers/stub_metrics"
 require_relative "helpers/stub_object_storage"
 require_relative "helpers/stub_env"
+require_relative "helpers/expect_offense"
 
 RSpec.configure do |config|
   config.mock_with :rspec
@@ -13,4 +14,6 @@ RSpec.configure do |config|
   config.include StubMetrics
   config.include StubObjectStorage
   config.include StubENV
+
+  config.include ExpectOffense, type: :rubocop
 end