CE application settings (not Docs) Cleanup

What does this MR do?

As part of https://gitlab.com/gitlab-org/gitlab-ce/issues/49155 and related to https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/20721, this is a small cleanup so that the docs and settings sync better together. Mostly alphabetizing, but a few typo fixes too.

Alphabetized: settings.rb application_setting.rb application_settings_helper.rb

Fixed in settings.rb:

• Typo in sidekiq_throttling_queus to sidekiq_throttling_queues
• Typo in performance_bar_allowed_group_id description (Depreated -> Deprecated)

Are there points in the code the reviewer needs to double check?

Does this MR meet the acceptance criteria?

• Changelog entry added, if necessary
• Documentation created/updated
• API support added
• Tests added for this feature/bug
• Conforms to the code review guidelines
  • Has been reviewed by a UX Designer
  • Has been reviewed by a Frontend maintainer
  • Has been reviewed by a Backend maintainer
  • Has been reviewed by a Database specialist
• Conforms to the merge request performance guidelines
• Conforms to the style guides
• Conforms to the database guides
• If you have multiple commits, please combine them into a few logically organized commits by squashing them
• Internationalization required/considered
• End-to-end tests pass (package-and-qa manual pipeline job)

What are the relevant issue numbers?