fix(onboarding): Harden SCM project creation against duplicates #250927

Job	Run time
detect what files changed	16s
select tests	0s
api docs test	0s
monolith-dbs test	0s
api url typescript generation	0s
backend migration tests	0s
backend typing	0s
check migration	0s
requirements check	0s
cli test	0s
calculate test shards	0s
backend test	-1s
Backend	3s
	18s

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