Inline `getDerivation` and `loadDerivation` #1735

Job	Run time
Check Docker secrets present for installer tests	1s
vm_tests	19m 26s
eval	49s
tests on ubuntu	18m 25s
tests on macos	16m 42s
installer test on ubuntu	31s
installer test on macos	1m 25s
flake_regressions	14m 8s
docker_push_image	0s
	1h 11m 27s

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