Improve remote store eval time #3001

Job	Run time
cabal	13s
build-extra-hackages	7s
cabal-doExactConfig	9s
check-materialization-concurrency	19s
closure-size	2s
check-path-support	5s
docs	23s
haskell-nix-roots-do-not-require-IFDs	13s
hix	25s
hix-cabal	7s
hydra-ifdLevel-0-and-1	3m 16s
hydra-ifdLevel-2	2m 59s
hydra-ifdLevel-3	13m 32s
hydra-without-remote-builders-ghc9101	39s
hydra-without-remote-builders-ghc966	7s
maintainer-scripts	8s
multi-target	31s
nix-build	36s
nix-tools	16s
plan-extra-hackages	6s
runghc	8s
shellFor-hoogle	10s
shellFor-multiple-package	14s
shellFor-not-depends	15s
shellFor-single-package	17s
tests-benchmarks	7s
unit-tests	5s
update-docs	5s
	25m 34s

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