revert(ci): undo unnecessary deepcopy in configure_split_db #14

Job	Run time
detect what files changed	11s
monolith-dbs test	7m 28s
backend migration tests	13m 28s
backend typing	2m 34s
cli test	2m 1s
api docs test	5m 51s
check migration	1m 17s
calculate test shards	4s
requirements check	0s
prepare selective tests	0s
api url typescript generation	0s
backend test (5)	12m 5s
backend test (2)	10m 51s
backend test (1)	12m 24s
backend test (0)	12m 24s
backend test (8)	12m 26s
backend test (6)	11m 52s
backend test (7)	12m 3s
backend test (3)	11m 47s
backend test (11)	11m 30s
backend test (4)	11m 28s
backend test (12)	12m 24s
backend test (16)	11m 56s
backend test (15)	12m 0s
backend test (19)	12m 16s
backend test (13)	11m 44s
backend test (21)	11m 59s
backend test (17)	13m 3s
backend test (9)	13m 1s
backend test (20)	12m 26s
backend test (18)	12m 44s
backend test (10)	11m 56s
backend test (14)	11m 30s
Backend	2s
	4h 58m 45s

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