feat(ci): xdist per-worker isolation infrastructure + sanity check wo… #1

Job	Run time
detect what files changed	12s
check migration	1m 14s
monolith-dbs test	6m 19s
backend typing	4m 3s
api docs test	5m 50s
backend migration tests	6m 19s
cli test	2m 2s
prepare selective tests	0s
calculate test shards	2m 7s
api url typescript generation	0s
requirements check	0s
backend test (0)	4m 9s
backend test (9)	4m 10s
backend test (2)	4m 10s
backend test (10)	4m 10s
backend test (8)	4m 8s
backend test (4)	4m 9s
backend test (5)	4m 9s
backend test (1)	4m 9s
backend test (3)	4m 9s
backend test (19)	4m 10s
backend test (14)	4m 10s
backend test (20)	4m 10s
backend test (6)	4m 9s
backend test (11)	4m 9s
backend test (21)	4m 10s
backend test (17)	4m 10s
backend test (7)	4m 9s
backend test (13)	4m 9s
backend test (12)	4m 10s
backend test (18)	4m 9s
backend test (15)	4m 8s
backend test (16)	4m 10s
Backend	3s
	1h 59m 35s

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