Add some frozen string to spec/**/*.rb

Adds frozen string to the following:

* spec/bin/**/*.rb
* spec/config/**/*.rb
* spec/controllers/**/*.rb

xref https://gitlab.com/gitlab-org/gitlab-ce/issues/59758

changelogs/unreleased/frozen-string-spec-some.yml

+---
+title: Add some frozen string to spec/**/*.rb
+merge_request:
+author: gfyoung
+type: other

spec/bin/changelog_spec.rb

+# frozen_string_literal: true
+
 require 'spec_helper'
 
 load File.expand_path('../../bin/changelog', __dir__)

spec/config/mail_room_spec.rb

+# frozen_string_literal: true
+
 require 'spec_helper'
 
 describe 'mail_room.yml' do

spec/config/object_store_settings_spec.rb

+# frozen_string_literal: true
+
 require 'spec_helper'
 require Rails.root.join('config', 'object_store_settings.rb')
 

spec/config/settings_spec.rb

+# frozen_string_literal: true
+
 require 'spec_helper'
 
 describe Settings do

spec/controllers/abuse_reports_controller_spec.rb

+# frozen_string_literal: true
+
 require 'spec_helper'
 
 describe AbuseReportsController do

spec/controllers/admin/application_settings_controller_spec.rb

+# frozen_string_literal: true
+
 require 'spec_helper'
 
 describe Admin::ApplicationSettingsController do

spec/controllers/admin/applications_controller_spec.rb

+# frozen_string_literal: true
+
 require 'spec_helper'
 
 describe Admin::ApplicationsController do

spec/controllers/admin/dashboard_controller_spec.rb

+# frozen_string_literal: true
+
 require 'spec_helper'
 
 describe Admin::DashboardController do

spec/controllers/admin/gitaly_servers_controller_spec.rb

+# frozen_string_literal: true
+
 require 'spec_helper'
 
 describe Admin::GitalyServersController do

spec/controllers/admin/groups_controller_spec.rb

+# frozen_string_literal: true
+
 require 'spec_helper'
 
 describe Admin::GroupsController do

spec/controllers/admin/health_check_controller_spec.rb

+# frozen_string_literal: true
+
 require 'spec_helper'
 
 describe Admin::HealthCheckController do

spec/controllers/admin/hooks_controller_spec.rb

+# frozen_string_literal: true
+
 require 'spec_helper'
 
 describe Admin::HooksController do

spec/controllers/admin/identities_controller_spec.rb

+# frozen_string_literal: true
+
 require 'spec_helper'
 
 describe Admin::IdentitiesController do

spec/controllers/admin/impersonations_controller_spec.rb

+# frozen_string_literal: true
+
 require 'spec_helper'
 
 describe Admin::ImpersonationsController do

spec/controllers/admin/projects_controller_spec.rb

+# frozen_string_literal: true
+
 require 'spec_helper'
 
 describe Admin::ProjectsController do

spec/controllers/admin/runners_controller_spec.rb

+# frozen_string_literal: true
+
 require 'spec_helper'
 
 describe Admin::RunnersController do

spec/controllers/admin/services_controller_spec.rb

+# frozen_string_literal: true
+
 require 'spec_helper'
 
 describe Admin::ServicesController do

spec/controllers/admin/spam_logs_controller_spec.rb

+# frozen_string_literal: true
+
 require 'spec_helper'
 
 describe Admin::SpamLogsController do

spec/controllers/admin/users_controller_spec.rb

+# frozen_string_literal: true
+
 require 'spec_helper'
 
 describe Admin::UsersController do