Fix process/config properties merging #7315

Job	Run time
cross-i386	1m 33s
test (ubuntu-20.04, 1.22.x, rootless, -race)	7m 23s
test (ubuntu-20.04, 1.22.x, rootless)	7m 18s
test (ubuntu-20.04, 1.22.x, -race)	7m 49s
test (ubuntu-20.04, 1.22.x)	7m 13s
test (ubuntu-20.04, 1.23.x, rootless, -race)	7m 10s
test (ubuntu-20.04, 1.23.x, rootless)	7m 52s
test (ubuntu-20.04, 1.23.x, -race)	8m 19s
test (ubuntu-20.04, 1.23.x)	7m 7s
test (ubuntu-20.04, 1.23.x, criu-dev)	8m 0s
test (ubuntu-24.04, 1.22.x, rootless, -race)	11m 35s
test (ubuntu-24.04, 1.22.x, rootless)	9m 13s
test (ubuntu-24.04, 1.22.x, -race)	10m 54s
test (ubuntu-24.04, 1.22.x)	7m 53s
test (ubuntu-24.04, 1.23.x, rootless, -race)	11m 36s
test (ubuntu-24.04, 1.23.x, rootless)	10m 51s
test (ubuntu-24.04, 1.23.x, -race)	8m 1s
test (ubuntu-24.04, 1.23.x)	7m 14s
test (ubuntu-24.04, 1.23.x, criu-dev)	7m 58s
test (actuated-arm64-6cpu-8gb, 1.23.x, rootless)	11m 38s
test (actuated-arm64-6cpu-8gb, 1.23.x)	7m 52s
all-done	0s
	2h 54m 29s

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