[Engineering] Highlight paid features during active trial – Part 2

What’s in part 2

MR	Description
!59535 (merged)	Add the feature name to the paid feature callout badge's tooltip
!59537 (merged)	Improve mobile-friendliness of paid feature highlight experiment
!60325 (merged)	Add the golden tanuki illustration to the informational popover
!58832 (merged)	Add the two CTA buttons and track their usage