[1.2] drop runc-dmz solution according to overlay solution #6880

Job	Run time
cross-i386	1m 1s
test (ubuntu-20.04, 1.22.x, rootless, -race)	7m 32s
test (ubuntu-20.04, 1.22.x, rootless)	7m 36s
test (ubuntu-20.04, 1.22.x, -race)	7m 49s
test (ubuntu-20.04, 1.22.x)	6m 55s
test (ubuntu-20.04, 1.23.x, rootless, -race)	7m 46s
test (ubuntu-20.04, 1.23.x, rootless)	7m 16s
test (ubuntu-20.04, 1.23.x, -race)	8m 10s
test (ubuntu-20.04, 1.23.x)	7m 24s
test (ubuntu-20.04, 1.23.x, criu-dev)	7m 44s
test (ubuntu-24.04, 1.22.x, rootless, -race)	9m 28s
test (ubuntu-24.04, 1.22.x, rootless)	9m 37s
test (ubuntu-24.04, 1.22.x, -race)	7m 47s
test (ubuntu-24.04, 1.22.x)	7m 9s
test (ubuntu-24.04, 1.23.x, rootless, -race)	9m 55s
test (ubuntu-24.04, 1.23.x, rootless)	9m 40s
test (ubuntu-24.04, 1.23.x, -race)	8m 7s
test (ubuntu-24.04, 1.23.x)	7m 33s
test (ubuntu-24.04, 1.23.x, criu-dev)	8m 5s
test (actuated-arm64-6cpu-8gb, 1.23.x, rootless)	11m 28s
test (actuated-arm64-6cpu-8gb, 1.23.x)	8m 7s
all-done	1s
	2h 46m 10s

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