[WIP] testing updated snapshotters #5953

Job	Run time
build (windows/amd64)	1m 51s
sandbox-build (linux/amd64)	7m 5s
sandbox-build (linux/arm64)	2m 20s
build (freebsd/amd64)	1m 43s
test-windows-amd64 (containerd, ./client)	6m 17s
test-freebsd-amd64	2m 27s
test-windows-amd64 (containerd, ./cmd/buildctl)	2m 12s
test-windows-amd64 (containerd, ./worker/containerd)	3m 53s
test-windows-amd64 (containerd, ./solver)	1m 34s
test-windows-amd64 (containerd, ./frontend)	2m 12s
test-windows-amd64 (containerd, ./frontend/dockerfile)	40m 48s
test-windows-amd64 (./..., 1)	3m 11s
	1h 15m 33s

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