replace context.WithCancel with WithCancelCause #2218

Job	Run time
prepare	5s
binaries (darwin/amd64)	1m 1s
binaries (darwin/arm64)	1m 11s
binaries (linux/amd64)	2m 1s
binaries (linux/arm/v7)	2m 15s
binaries (linux/arm64)	2m 0s
binaries (linux/s390x)	2m 6s
binaries (linux/ppc64le)	2m 1s
binaries (linux/riscv64)	2m 1s
binaries (windows/amd64)	57s
binaries (windows/arm64)	54s
test / prepare	1m 42s
test / run (containerd, ./client ./cmd/buildctl ./worker/containerd ./solver ./frontend, integration)	6m 56s
test / run (containerd-rootless, ./client ./cmd/buildctl ./worker/containerd ./solver ./frontend, integr...	8m 45s
test / run (containerd-1.6, ./client ./cmd/buildctl ./worker/containerd ./solver ./frontend, integration)	11m 7s
test / run (containerd-snapshotter-stargz, ./client ./cmd/buildctl ./worker/containerd ./solver ./fronte...	8m 50s
test / run (oci, ./client ./cmd/buildctl ./worker/containerd ./solver ./frontend, integration)	8m 32s
test / run (oci-rootless, ./client ./cmd/buildctl ./worker/containerd ./solver ./frontend, integration)	8m 12s
test / run (oci-snapshotter-stargz, ./client ./cmd/buildctl ./worker/containerd ./solver ./frontend, int...	8m 26s
test / run (./..., 1, integration gateway)	3m 59s
test / run (./client, containerd, nydus, integration)	7m 25s
test / run (./client, oci, nydus, integration)	5m 22s
test / run (./..., nydus, 1, integration)	3m 59s
image	0s
release	0s
	1h 39m 47s

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