Fix `nix upgrade-nix` profile search #13675

Job	Run time
eval	57s
Check Cachix and Docker secrets present for installer tests	1s
vm_tests	21m 44s
tests (ubuntu-latest)	21m 2s
tests (macos-latest)	11m 27s
installer	0s
installer_test	0s
flake_regressions	16m 6s
docker_push_image	0s
	1h 11m 17s

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