Inline `getDerivation` and `loadDerivation` #1726

Job	Run time
eval	49s
Check Docker secrets present for installer tests	1s
vm_tests	19m 51s
tests on ubuntu	17m 28s
tests on macos	14m 41s
installer test on ubuntu	44s
installer test on macos	1m 19s
flake_regressions	13m 52s
docker_push_image	0s
	1h 8m 45s

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