Increase the visibility of the keyboard shortcut for Global Search

What does this MR do and why?

closes issue: #342427 (closed)

This commit adds a keyboard shortcut visual cue to search the input field. It is automatically hidden when input fields become active. Visual cue adjusts to all possible color themes. It also overpowers the clear button when there is input in the field but the field is not active.

Screenshots or screen recordings

Dark	Light	Light Red	Red

Light Green	Green	Light Blue	Blue

Light Indigo	indigo	Dark Mode

How to set up and validate locally

There is no setup necessary, the only thing you can do is to change the navigation theme via preferences to reveal all color combinations.

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this MR.