runc exec: implement CPU affinity #7521

Job	Run time
cross-i386	1m 14s
test (ubuntu-24.04, 1.23.x, rootless, -race)	10m 4s
test (ubuntu-24.04, 1.23.x, rootless)	9m 37s
test (ubuntu-24.04, 1.23.x, -race)	7m 22s
test (ubuntu-24.04, 1.23.x)	6m 55s
test (ubuntu-24.04, 1.23.x, criu-dev)	7m 12s
test (ubuntu-24.04, 1.24.x, rootless, -race)	10m 6s
test (ubuntu-24.04, 1.24.x, rootless)	9m 53s
test (ubuntu-24.04, 1.24.x, -race)	8m 8s
test (ubuntu-24.04, 1.24.x)	7m 31s
test (ubuntu-24.04, 1.24.x, criu-dev)	8m 7s
test (actuated-arm64-6cpu-8gb, 1.23.x, rootless)	11m 59s
test (actuated-arm64-6cpu-8gb, 1.23.x)	8m 2s
test (actuated-arm64-6cpu-8gb, 1.24.x, rootless)	12m 0s
test (actuated-arm64-6cpu-8gb, 1.24.x)	8m 5s
all-done	0s
	2h 6m 15s

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