Split PR CI in two (one essential/fast and one optional/slow/verbose) #206

Job	Run time
run_tests (basic, ../params.example.yaml) / build	1m 55s
run_tests (cold_storage, ../params.example.yaml) / build	1m 20s
run_tests (presign, ../params.example.yaml) / build	1m 6s
tests-success	1s
cleanup_tests / cleanup	1m 50s
	6m 12s

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