Enable Rubocop Performance/InefficientHashSearch

When used with a Hash, `.keys.include?` is bad because:

1. It performs a O(n) search instead of the efficient `.has_key?`
2. It clones all keys into separate array.

Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/64975

.rubocop_todo.yml

@@ -262,17 +262,6 @@ Naming/HeredocDelimiterNaming:
 Naming/RescuedExceptionsVariableName:
   Enabled: false
-# Offense count: 6
-# Cop supports --auto-correct.
-Performance/InefficientHashSearch:
-  Exclude:
-    - 'app/controllers/concerns/sessionless_authentication.rb'
-    - 'app/models/note.rb'
-    - 'app/models/user_preference.rb'
-    - 'ee/app/models/ee/project.rb'
-    - 'lib/gitlab/import_export/members_mapper.rb'
-    - 'qa/spec/spec_helper.rb'
-
 # Offense count: 3
 # Cop supports --auto-correct.
 Performance/ReverseEach:

app/controllers/concerns/sessionless_authentication.rb

@@ -13,7 +13,7 @@ module SessionlessAuthentication
   end
   def sessionless_user?
-    current_user && !session.keys.include?('warden.user.user.key')
+    current_user && !session.key?('warden.user.user.key')
   end
   def sessionless_sign_in(user)

app/models/note.rb

@@ -292,7 +292,7 @@ class Note < ApplicationRecord
   end
   def special_role=(role)
-    raise "Role is undefined, #{role} not found in #{SpecialRole.values}" unless SpecialRole.values.include?(role)
+    raise "Role is undefined, #{role} not found in #{SpecialRole.values}" unless SpecialRole.value?(role)
     @special_role = role
   end

app/models/user_preference.rb

@@ -26,7 +26,7 @@ class UserPreference < ApplicationRecord
   def set_notes_filter(filter_id, issuable)
     # No need to update the column if the value is already set.
-    if filter_id && NOTES_FILTERS.values.include?(filter_id)
+    if filter_id && NOTES_FILTERS.value?(filter_id)
       field = notes_filter_field_for(issuable)
       self[field] = filter_id

qa/spec/spec_helper.rb

@@ -46,7 +46,7 @@ RSpec.configure do |config|
   if ENV['CI']
     config.around do |example|
-      retry_times = example.metadata.keys.include?(:quarantine) ? 1 : 2
+      retry_times = example.metadata.key?(:quarantine) ? 1 : 2
       example.run_with_retry retry: retry_times
     end
   end