Fix Style/FrozenStringLiteralComment violations in qa

Auto-corrected with Rubocop

.rubocop_manual_todo.yml

@@ -2497,14 +2497,6 @@ Style/FrozenStringLiteralComment:
     - 'bin/secpick'
     - 'danger/changes_size/Dangerfile'
     - 'danger/metadata/Dangerfile'
-    - 'qa/Gemfile'
-    - 'qa/Rakefile'
-    - 'qa/bin/qa'
-    - 'qa/bin/rubymine'
-    - 'qa/qa/fixtures/auto_devops_rack/Gemfile'
-    - 'qa/qa/fixtures/auto_devops_rack/Rakefile'
-    - 'qa/qa/fixtures/auto_devops_rack/config.ru'
-    - 'qa/qa/page/page_concern.rb'
     - 'scripts/flaky_examples/detect-new-flaky-examples'
     - 'scripts/flaky_examples/prune-old-flaky-examples'
     - 'scripts/gather-test-memory-data'

qa/Gemfile

+# frozen_string_literal: true
+
 source 'https://rubygems.org'
 
 gem 'gitlab-qa'

qa/Rakefile

+# frozen_string_literal: true
+
 require_relative 'qa/tools/revoke_all_personal_access_tokens'
 require_relative 'qa/tools/delete_subgroups'
 require_relative 'qa/tools/generate_perf_testdata'

qa/bin/qa

 #!/usr/bin/env ruby
+# frozen_string_literal: true
 
 require_relative '../qa'
 

qa/bin/rubymine

 #!/usr/bin/env ruby
+# frozen_string_literal: true
 
 require_relative '../qa'
 

qa/qa/fixtures/auto_devops_rack/Gemfile

+# frozen_string_literal: true
+
 source 'https://rubygems.org'
 gem 'rack'
 gem 'rake'

qa/qa/fixtures/auto_devops_rack/Rakefile

+# frozen_string_literal: true
+
 require 'rake/testtask'
 
 task default: %w[test]

qa/qa/fixtures/auto_devops_rack/config.ru

+# frozen_string_literal: true
+
 run lambda { |env| [200, { 'Content-Type' => 'text/plain' }, StringIO.new("Hello World! #{ENV['OPTIONAL_MESSAGE']}\n")] }

qa/qa/page/page_concern.rb

+# frozen_string_literal: true
+
 module QA
   module Page
     module PageConcern