libct/cap: switch to moby/sys/capability, lazy init #6927

Job	Run time
cross-i386	1m 28s
test (ubuntu-20.04, 1.22.x, rootless, -race)	7m 24s
test (ubuntu-20.04, 1.22.x, rootless)	7m 23s
test (ubuntu-20.04, 1.22.x, -race)	8m 4s
test (ubuntu-20.04, 1.22.x)	7m 29s
test (ubuntu-20.04, 1.23.x, rootless, -race)	7m 51s
test (ubuntu-20.04, 1.23.x, rootless)	7m 14s
test (ubuntu-20.04, 1.23.x, -race)	8m 18s
test (ubuntu-20.04, 1.23.x)	7m 33s
test (ubuntu-20.04, 1.23.x, criu-dev)	8m 12s
test (ubuntu-24.04, 1.22.x, rootless, -race)	9m 55s
test (ubuntu-24.04, 1.22.x, rootless)	9m 33s
test (ubuntu-24.04, 1.22.x, -race)	8m 0s
test (ubuntu-24.04, 1.22.x)	7m 29s
test (ubuntu-24.04, 1.23.x, rootless, -race)	9m 48s
test (ubuntu-24.04, 1.23.x, rootless)	9m 36s
test (ubuntu-24.04, 1.23.x, -race)	7m 47s
test (ubuntu-24.04, 1.23.x)	7m 37s
test (ubuntu-24.04, 1.23.x, criu-dev)	7m 51s
test (actuated-arm64-6cpu-8gb, 1.23.x, rootless)	11m 53s
test (actuated-arm64-6cpu-8gb, 1.23.x)	8m 23s
all-done	3s
	2h 48m 51s

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