No global settings in `libnixfetchers` and `libnixflake` #11102

Job	Run time
meson_build (ubuntu-latest)	10m 28s
vm_tests	24m 5s
meson_build (macos-latest)	4m 57s
Check Cachix and Docker secrets present for installer tests	1s
tests (ubuntu-latest)	50m 16s
tests (macos-latest)	36m 46s
docker_push_image	0s
installer	0s
installer_test	0s
	2h 6m 33s

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