nix path-info: Don't write to std::cout directly (backport #11884) #13223

Job	Run time
vm_tests	22m 9s
Check Cachix and Docker secrets present for installer tests	1s
meson_build (ubuntu-latest)	38s
meson_build (macos-latest)	1m 12s
tests (ubuntu-latest)	28m 56s
tests (macos-latest)	44m 28s
flake_regressions	36m 21s
docker_push_image	0s
installer	0s
installer_test	0s
	2h 13m 45s

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