Update upsell banners and notification

[marija-nikolic]

The x - close icon on the pink upsell banners (settings and bulk optimization page) and notifications in the toolbar menu should be updated with the icon we are using in other banners and alignment should be improved according to our brand guidelines.

Example with the icon we would like to use:

Mocflow docs available here.

NB: Please follow our brand guidelines for colors, icons, alignment, fonts, etc., as the Mocflow file is not a design file and may not always include every detail.