configure crun as the low-level runtime to prioritise when using CRI-O #498

Job	Run time
validate-helm-values	36s
validate-csv	35s
helm-lint	7s
go-check	2m 6s
go-build	1m 40s
unit tests	59s
build-gpu-operator (ubi9)	17m 11s
build-gpu-operator-validator (ubi9)	11m 30s
e2e-tests-nvidiadriver	34m 0s
e2e-tests-containerd	47m 24s
	1h 56m 8s

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