fix(ci): rename xdist workflow to 'backend' for collect-test-data compat #8

Job	Run time
detect what files changed	12s
check migration	1m 20s
cli test	2m 5s
monolith-dbs test	7m 38s
backend migration tests	13m 27s
api docs test	5m 45s
backend typing	4m 39s
prepare selective tests	0s
calculate test shards	3s
api url typescript generation	0s
requirements check	0s
backend test (0)	14m 0s
backend test (5)	12m 24s
backend test (1)	12m 5s
backend test (3)	10m 19s
backend test (4)	11m 33s
backend test (15)	11m 34s
backend test (8)	12m 46s
backend test (2)	12m 48s
backend test (9)	12m 6s
backend test (11)	12m 3s
backend test (13)	12m 24s
backend test (21)	11m 51s
backend test (6)	11m 57s
backend test (10)	11m 50s
backend test (7)	12m 58s
backend test (17)	12m 54s
backend test (16)	9m 55s
backend test (12)	12m 23s
backend test (14)	11m 32s
backend test (19)	11m 33s
backend test (20)	12m 54s
backend test (18)	12m 7s
Backend	2s
	5h 1m 7s

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