add a test for runc exec --cap #6580

Job	Run time
cross-i386	1m 22s
cross-i386 (runc_nodmz)	1m 20s
test (ubuntu-20.04, 1.22.x, rootless, -race)	7m 12s
test (ubuntu-20.04, 1.22.x, rootless)	6m 49s
test (ubuntu-20.04, 1.22.x, -race)	8m 12s
test (ubuntu-20.04, 1.22.x)	7m 16s
test (ubuntu-20.04, 1.23.x, rootless, -race)	7m 17s
test (ubuntu-20.04, 1.23.x, rootless)	6m 47s
test (ubuntu-20.04, 1.23.x, -race)	8m 18s
test (ubuntu-20.04, 1.23.x)	7m 16s
test (ubuntu-20.04, 1.23.x, criu-dev)	8m 15s
test (ubuntu-24.04, 1.22.x, rootless, -race)	9m 24s
test (ubuntu-24.04, 1.22.x, rootless)	9m 13s
test (ubuntu-24.04, 1.22.x, -race)	8m 4s
test (ubuntu-24.04, 1.22.x)	7m 19s
test (ubuntu-24.04, 1.23.x, rootless, -race)	10m 35s
test (ubuntu-24.04, 1.23.x, rootless)	9m 18s
test (ubuntu-24.04, 1.23.x, -race)	8m 6s
test (ubuntu-24.04, 1.23.x)	7m 7s
test (ubuntu-24.04, 1.23.x, runc_nodmz)	7m 4s
test (ubuntu-24.04, 1.23.x, criu-dev)	7m 56s
test (actuated-arm64-6cpu-8gb, 1.23.x, rootless)	11m 40s
test (actuated-arm64-6cpu-8gb, 1.23.x)	8m 49s
all-done	1s
	2h 54m 40s

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