Fix confirmed Django N+1 queries (#4782) #3507

Job	Run time
Check backend needs building	12s
Check frontend needs building	10s
Check pretix needs building	12s
Build backend / Build	2m 32s
Build pretix	0s
Deploy backend	39s
Wait backend deployment	1m 50s
Deploy frontend	47s
Build frontend	-1s
Wait frontend deployment	11s
	6m 32s

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