feat(occurrences on eap): Implement `run_stats_query` in Occurrences EAP RPC class #250735

Job	Run time
detect what files changed	13s
api docs test	5m 55s
cli test	1m 59s
select tests	41s
check migration	1m 6s
monolith-dbs test	7m 36s
backend migration tests	8m 54s
backend typing	4m 22s
requirements check	0s
api url typescript generation	0s
calculate test shards	8s
backend test (7)	8m 51s
backend test (8)	12m 16s
backend test (4)	8m 32s
backend test (3)	7m 53s
backend test (6)	8m 30s
backend test (9)	9m 5s
backend test (5)	8m 36s
backend test (0)	8m 39s
backend test (2)	8m 4s
backend test (13)	9m 12s
backend test (11)	8m 29s
backend test (14)	8m 34s
backend test (10)	8m 13s
backend test (15)	8m 52s
backend test (12)	9m 49s
backend test (1)	8m 52s
backend test (17)	8m 59s
backend test (21)	8m 43s
backend test (19)	8m 10s
backend test (16)	7m 19s
backend test (18)	8m 8s
backend test (20)	8m 20s
Backend	4s
	3h 43m 4s

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