Add ellipsis to create new tooltip

What does this MR do and why?

Adds ellipsis to the tooltip of the create new dropdown in the top header as per guidance in !90204 (comment 1007551836).

Screenshots or screen recordings

Before	After

How to set up and validate locally

• Hover on the + dropdown in the top header
• View tooltip

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.

Related to #362122 (closed)