feat(feature-showcase): Redesign and rewrite FeatureTourModal as FeatureShowcase #248895

Job	Run time
detect what files changed	11s
backend migration tests	8m 54s
select tests	34s
cli test	1m 53s
api docs test	5m 15s
backend typing	4m 1s
monolith-dbs test	7m 10s
requirements check	0s
check migration	0s
api url typescript generation	0s
calculate test shards	7s
backend test (0)	4m 9s
Backend	3s
	32m 17s

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