Introduce `nix derivation instantiate` #12640

Job	Run time
vm_tests	17m 56s
Check Cachix and Docker secrets present for installer tests	1s
tests (ubuntu-latest)	27m 21s
tests (macos-latest)	34m 6s
flake_regressions	24m 42s
installer	0s
docker_push_image	0s
installer_test	0s
	1h 44m 6s

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