Hide keyboard shortcuts in tooltips when disabled

What does this MR do and why?

Hide keyboard shortcuts in tooltips when that user preference is disabled.

Follows approach from !140979 (merged), and applies it to the changes in !141526 (merged), !141154 (merged), and !140965 (merged)

Additionally:

• Sanitize HTML in tooltips
• Use keysFor function to get shortcut keys

MR acceptance checklist

Please evaluate this MR against the MR acceptance checklist. It helps you analyze changes to reduce risks in quality, performance, reliability, security, and maintainability.

Screenshots or screen recordings

Screenshots are required for UI changes, and strongly recommended for all other merge requests.

Location	Shortcuts disabled	Shortcuts enabled
Issue		CleanShot 20240110172557.mp4 CleanShot 20240110120949.mp4
Epic		CleanShot 20240110172635.mp4
Repository folder
Repository file

How to set up and validate locally

Do these steps with keyboard shortcuts enabled and disabled:

1. Visit an issue and hover/focus
   1. “Edit” button
   2. “Edit” button for assignee
   3. “Edit” button for labels
2. Visit an epic and hover/focus
   1. “Edit” button“
   2. “Edit” button for labels
3. Open the repository view or a specific folder, select the “Edit” dropdown, and see the Web IDE option
4. Open a file in the repository and see the Web IDE option