Fix process/config properties merging #7267

Job	Run time
cross-i386	1m 13s
test (ubuntu-20.04, 1.22.x, rootless, -race)	2m 44s
test (ubuntu-20.04, 1.22.x, rootless)	2m 5s
test (ubuntu-20.04, 1.22.x, -race)	1m 43s
test (ubuntu-20.04, 1.22.x)	1m 18s
test (ubuntu-20.04, 1.23.x, rootless, -race)	2m 37s
test (ubuntu-20.04, 1.23.x, rootless)	2m 23s
test (ubuntu-20.04, 1.23.x, -race)	1m 46s
test (ubuntu-20.04, 1.23.x)	1m 25s
test (ubuntu-20.04, 1.23.x, criu-dev)	1m 47s
test (ubuntu-24.04, 1.22.x, rootless, -race)	2m 40s
test (ubuntu-24.04, 1.22.x, rootless)	2m 6s
test (ubuntu-24.04, 1.22.x, -race)	1m 53s
test (ubuntu-24.04, 1.22.x)	57s
test (ubuntu-24.04, 1.23.x, rootless, -race)	2m 37s
test (ubuntu-24.04, 1.23.x, rootless)	2m 28s
test (ubuntu-24.04, 1.23.x, -race)	1m 51s
test (ubuntu-24.04, 1.23.x)	1m 29s
test (ubuntu-24.04, 1.23.x, criu-dev)	2m 18s
test (actuated-arm64-6cpu-8gb, 1.23.x, rootless)	2m 26s
test (actuated-arm64-6cpu-8gb, 1.23.x)	1m 4s
all-done	0s
	40m 50s

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