nix path-info: Don't write to std::cout directly #13222

Job	Run time
meson_build (ubuntu-latest)	36s
Check Cachix and Docker secrets present for installer tests	1s
meson_build (macos-latest)	1m 18s
vm_tests	22m 43s
tests (ubuntu-latest)	29m 28s
tests (macos-latest)	46m 34s
flake_regressions	38m 37s
docker_push_image	0s
installer	48m 15s
installer_test (ubuntu-latest)	47s
installer_test (macos-latest)	1m 33s
	3h 9m 52s

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