Adjust code suggestion alert dismissal

What does this MR do and why?

Adjust code_suggestions_ga_non_owner_alert dismissal behavior to dismiss on primary CTA click AND "X" click

How to set up and validate locally

• Follow !138971 (merged)
• Make sure Try now dismiss banner.

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 #434415