libct/cap: switch to moby/sys/capability, lazy init #6928

Job	Run time
test (ubuntu-20.04, 1.22.x, rootless, -race)	7m 45s
test (ubuntu-20.04, 1.22.x, rootless)	7m 22s
test (ubuntu-20.04, 1.22.x, -race)	8m 0s
test (ubuntu-20.04, 1.22.x)	7m 50s
test (ubuntu-20.04, 1.23.x, rootless, -race)	7m 42s
test (ubuntu-20.04, 1.23.x, rootless)	7m 32s
cross-i386	1m 32s
test (ubuntu-20.04, 1.23.x, -race)	8m 28s
test (ubuntu-20.04, 1.23.x)	7m 26s
test (ubuntu-20.04, 1.23.x, criu-dev)	7m 59s
test (ubuntu-24.04, 1.22.x, rootless, -race)	9m 46s
test (ubuntu-24.04, 1.22.x, rootless)	9m 19s
test (ubuntu-24.04, 1.22.x, -race)	8m 24s
test (ubuntu-24.04, 1.22.x)	7m 27s
test (ubuntu-24.04, 1.23.x, rootless, -race)	9m 38s
test (ubuntu-24.04, 1.23.x, rootless)	9m 26s
test (ubuntu-24.04, 1.23.x, -race)	7m 52s
test (ubuntu-24.04, 1.23.x)	7m 40s
test (ubuntu-24.04, 1.23.x, criu-dev)	7m 53s
test (actuated-arm64-6cpu-8gb, 1.23.x, rootless)	11m 57s
test (actuated-arm64-6cpu-8gb, 1.23.x)	8m 24s
all-done	1s
	2h 49m 23s

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