runc exec: implement CPU affinity #7299

Job	Run time
cross-i386	57s
test (ubuntu-20.04, 1.22.x, rootless, -race)	7m 18s
test (ubuntu-20.04, 1.22.x, rootless)	7m 9s
test (ubuntu-20.04, 1.22.x, -race)	7m 50s
test (ubuntu-20.04, 1.22.x)	7m 22s
test (ubuntu-20.04, 1.23.x, rootless, -race)	7m 26s
test (ubuntu-20.04, 1.23.x, rootless)	7m 11s
test (ubuntu-20.04, 1.23.x, -race)	7m 50s
test (ubuntu-20.04, 1.23.x)	7m 19s
test (ubuntu-20.04, 1.23.x, criu-dev)	7m 57s
test (ubuntu-24.04, 1.22.x, rootless, -race)	9m 35s
test (ubuntu-24.04, 1.22.x, rootless)	9m 22s
test (ubuntu-24.04, 1.22.x, -race)	8m 41s
test (ubuntu-24.04, 1.22.x)	6m 53s
test (ubuntu-24.04, 1.23.x, rootless, -race)	10m 7s
test (ubuntu-24.04, 1.23.x, rootless)	9m 59s
test (ubuntu-24.04, 1.23.x, -race)	8m 2s
test (ubuntu-24.04, 1.23.x)	7m 27s
test (ubuntu-24.04, 1.23.x, criu-dev)	7m 51s
test (actuated-arm64-6cpu-8gb, 1.23.x, rootless)	11m 36s
test (actuated-arm64-6cpu-8gb, 1.23.x)	7m 54s
all-done	1s
	2h 45m 47s

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