Draft: Resolve "copy labels for quick actions input in another issue"

What does this MR do and why?

Adds a copy to clipboard button to the labels sidebar element which copies the quick action command with all current labels to the clipboard which then can be easily pasted into the comment box.

Screenshots or screen recordings

How to set up and validate locally

Numbered steps to set up and validate the change are strongly suggested.

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.

Closes #23666