Use view transaction for metadata read #4946

Job	Run time
prepare	1s
test / prepare	2m 11s
test / run (containerd, ./frontend/dockerfile, integration)	4m 52s
test / run (containerd, ./frontend/dockerfile, dockerfile)	6m 46s
test / run (containerd-rootless, ./frontend/dockerfile, integration)	4m 51s
test / run (containerd-rootless, ./frontend/dockerfile, dockerfile)	6m 43s
test / run (containerd-1.6, ./frontend/dockerfile, integration)	4m 50s
test / run (containerd-1.6, ./frontend/dockerfile, dockerfile)	6m 54s
test / run (containerd-1.7, ./frontend/dockerfile, integration)	5m 2s
test / run (containerd-1.7, ./frontend/dockerfile, dockerfile)	7m 55s
test / run (containerd-snapshotter-stargz, ./frontend/dockerfile, integration)	5m 21s
test / run (containerd-snapshotter-stargz, ./frontend/dockerfile, dockerfile)	8m 25s
test / run (oci, ./frontend/dockerfile, integration)	4m 56s
test / run (oci, ./frontend/dockerfile, dockerfile)	5m 47s
test / run (oci-rootless, ./frontend/dockerfile, integration)	4m 26s
test / run (oci-rootless, ./frontend/dockerfile, dockerfile)	6m 16s
test / run (oci-rootless-slirp4netns-detachnetns, ./frontend/dockerfile, integration)	4m 48s
test / run (oci-rootless-slirp4netns-detachnetns, ./frontend/dockerfile, dockerfile)	5m 46s
test / run (oci-snapshotter-stargz, ./frontend/dockerfile, integration)	4m 55s
test / run (oci-snapshotter-stargz, ./frontend/dockerfile, dockerfile)	6m 12s
image (mainline)	5m 21s
image (labs)	5m 16s
scout	0s
release	0s
	1h 57m 34s

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