protobuf: remove gogoproto #4315

Job	Run time
prepare	1s
test / prepare	1m 46s
test / run (containerd, ./frontend/dockerfile, integration)	4m 31s
test / run (containerd, ./frontend/dockerfile, dockerfile)	6m 33s
test / run (containerd-rootless, ./frontend/dockerfile, integration)	4m 27s
test / run (containerd-rootless, ./frontend/dockerfile, dockerfile)	6m 48s
test / run (containerd-1.6, ./frontend/dockerfile, integration)	4m 32s
test / run (containerd-1.6, ./frontend/dockerfile, dockerfile)	6m 52s
test / run (containerd-snapshotter-stargz, ./frontend/dockerfile, integration)	5m 0s
test / run (containerd-snapshotter-stargz, ./frontend/dockerfile, dockerfile)	8m 14s
test / run (oci, ./frontend/dockerfile, integration)	4m 6s
test / run (oci, ./frontend/dockerfile, dockerfile)	5m 31s
test / run (oci-rootless, ./frontend/dockerfile, integration)	4m 3s
test / run (oci-rootless, ./frontend/dockerfile, dockerfile)	5m 19s
test / run (oci-rootless-slirp4netns-detachnetns, ./frontend/dockerfile, integration)	4m 37s
test / run (oci-rootless-slirp4netns-detachnetns, ./frontend/dockerfile, dockerfile)	5m 18s
test / run (oci-snapshotter-stargz, ./frontend/dockerfile, integration)	4m 7s
test / run (oci-snapshotter-stargz, ./frontend/dockerfile, dockerfile)	5m 30s
image (mainline)	5m 9s
image (labs)	5m 16s
scout	0s
release	0s
	1h 37m 40s

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