Fix process/config properties merging #7269

Job	Run time
cross-i386	1m 34s
test (ubuntu-20.04, 1.22.x, rootless, -race)	2m 41s
test (ubuntu-20.04, 1.22.x, rootless)	2m 12s
test (ubuntu-20.04, 1.22.x, -race)	7m 54s
test (ubuntu-20.04, 1.22.x)	7m 19s
test (ubuntu-20.04, 1.23.x, rootless, -race)	2m 41s
test (ubuntu-20.04, 1.23.x, rootless)	2m 34s
test (ubuntu-20.04, 1.23.x, -race)	7m 51s
test (ubuntu-20.04, 1.23.x)	7m 9s
test (ubuntu-20.04, 1.23.x, criu-dev)	7m 35s
test (ubuntu-24.04, 1.22.x, rootless, -race)	2m 36s
test (ubuntu-24.04, 1.22.x, rootless)	3m 42s
test (ubuntu-24.04, 1.22.x, -race)	7m 40s
test (ubuntu-24.04, 1.22.x)	6m 54s
test (ubuntu-24.04, 1.23.x, rootless, -race)	2m 56s
test (ubuntu-24.04, 1.23.x, rootless)	2m 45s
test (ubuntu-24.04, 1.23.x, -race)	8m 4s
test (ubuntu-24.04, 1.23.x)	7m 28s
test (ubuntu-24.04, 1.23.x, criu-dev)	7m 54s
test (actuated-arm64-6cpu-8gb, 1.23.x, rootless)	2m 25s
test (actuated-arm64-6cpu-8gb, 1.23.x)	7m 47s
all-done	0s
	1h 49m 41s

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