Merge branch 'rs-trailingwhitespace-cop' into 'master'

Enable Layout/TrailingWhitespace cop and auto-correct offenses

See merge request !13573

.rubocop.yml

@@ -251,6 +251,10 @@ Layout/Tab:
 Layout/TrailingBlankLines:
   Enabled: true
 
+# Avoid trailing whitespace.
+Layout/TrailingWhitespace:
+  Enabled: true
+
 # Style #######################################################################
 
 # Check the naming of accessor methods for get_/set_.

.rubocop_todo.yml

@@ -57,11 +57,6 @@ Layout/SpaceInsideParens:
 Layout/SpaceInsidePercentLiteralDelimiters:
   Enabled: false
 
-# Offense count: 89
-# Cop supports --auto-correct.
-Layout/TrailingWhitespace:
-  Enabled: false
-
 # Offense count: 272
 RSpec/EmptyLineAfterFinalLet:
   Enabled: false

lib/gitlab/import_export/attributes_finder.rb

 module Gitlab
   module ImportExport
     class AttributesFinder
-    
       def initialize(included_attributes:, excluded_attributes:, methods:)
         @included_attributes = included_attributes || {}
         @excluded_attributes = excluded_attributes || {}

spec/javascripts/fixtures/services.rb

@@ -8,7 +8,6 @@ describe Projects::ServicesController, '(JavaScript fixtures)', type: :controlle
   let(:project)   { create(:project_empty_repo, namespace: namespace, path: 'services-project') }
   let!(:service)  { create(:custom_issue_tracker_service, project: project, title: 'Custom Issue Tracker') }
 
-
   render_views
 
   before(:all) do