Banners should only be dismissable by clicking x button

What does this MR do?

With this MR we now have a close button in the Flash banners. However, if you click anywhere of the Flash banner it will be dismissed. This UX improvement changes the default behavior. Flash banners will only be dismissable with by clicking the x button. This will also fix the UX issue around trying to c/p error messages.

Screenshots

Does this MR meet the acceptance criteria?

Conformity

• Changelog entry
• Documentation created/updated or follow-up review issue created
• Code review guidelines
• Merge request performance guidelines
• Style guides
• Database guides
• Separation of EE specific content

Mentions #31492 (closed)