feat(notifications): Add notification data and renderer for metric alerts #245530

Job	Run time
detect what files changed	7s
prepare selective tests	1m 41s
cli test	2m 7s
backend migration tests	7m 41s
check migration	1m 26s
api docs test	5m 59s
backend typing	4m 58s
monolith-dbs test	7m 18s
requirements check	0s
api url typescript generation	0s
calculate test shards	2m 14s
backend test (2)	6m 7s
backend test (0)	6m 22s
backend test (1)	6m 22s
Backend	4s
	52m 26s

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