Add legacy job submission fallback #35382

Job	Run time
Check database indexes (postgresql, 18, 3.10)	1m 3s
Check database indexes (postgresql, 14, 3.10)	57s
Check database indexes (postgresql, 11, 3.10)	1m 12s
Check database indexes (postgresql, 10, 3.10)	53s
Check database indexes (postgresql, 9.6, 3.10)	1m 11s
Check database indexes (sqlite, 3.10)	50s
	6m 6s

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