tests: Move arq under toxgen #3837

Job	Run time
Tasks (latest) (3.8, ubuntu-22.04)	2m 25s
Tasks (latest) (3.12, ubuntu-22.04)	2m 1s
Tasks (latest) (3.7, ubuntu-22.04)	2m 11s
Tasks (pinned) (3.6, ubuntu-22.04)	4m 14s
Tasks (pinned) (3.9, ubuntu-22.04)	4m 12s
Tasks (latest) (3.11, ubuntu-22.04)	3m 6s
Tasks (latest) (3.13, ubuntu-22.04)	3m 12s
Tasks (latest) (3.10, ubuntu-22.04)	2m 33s
Tasks (pinned) (3.8, ubuntu-22.04)	4m 12s
Tasks (pinned) (3.13, ubuntu-22.04)	5m 5s
Tasks (pinned) (3.11, ubuntu-22.04)	4m 50s
Tasks (pinned) (3.7, ubuntu-22.04)	4m 54s
Tasks (pinned) (3.10, ubuntu-22.04)	4m 15s
Tasks (pinned) (3.12, ubuntu-22.04)	5m 31s
All pinned Tasks tests passed	2s
	52m 43s

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