Updated tests in frontend/dockerfile/dockerfile_test.go to run on Win… #4728

Job	Run time
prepare	1s
test / prepare	2m 5s
test / run (containerd, ./frontend/dockerfile, integration)	4m 58s
test / run (containerd, ./frontend/dockerfile, dockerfile)	12m 10s
test / run (containerd-rootless, ./frontend/dockerfile, integration)	5m 9s
test / run (containerd-rootless, ./frontend/dockerfile, dockerfile)	6m 33s
test / run (containerd-1.6, ./frontend/dockerfile, integration)	4m 41s
test / run (containerd-1.6, ./frontend/dockerfile, dockerfile)	7m 1s
test / run (containerd-snapshotter-stargz, ./frontend/dockerfile, integration)	4m 59s
test / run (containerd-snapshotter-stargz, ./frontend/dockerfile, dockerfile)	12m 22s
test / run (oci, ./frontend/dockerfile, integration)	4m 24s
test / run (oci, ./frontend/dockerfile, dockerfile)	5m 35s
test / run (oci-rootless, ./frontend/dockerfile, integration)	4m 43s
test / run (oci-rootless, ./frontend/dockerfile, dockerfile)	10m 42s
test / run (oci-rootless-slirp4netns-detachnetns, ./frontend/dockerfile, integration)	4m 14s
test / run (oci-rootless-slirp4netns-detachnetns, ./frontend/dockerfile, dockerfile)	5m 53s
test / run (oci-snapshotter-stargz, ./frontend/dockerfile, integration)	4m 25s
test / run (oci-snapshotter-stargz, ./frontend/dockerfile, dockerfile)	10m 57s
image (mainline)	5m 13s
image (labs)	4m 59s
release	0s
scout	0s
	2h 1m 4s

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