Add available targets to plan.json #2469

Job	Run time
cabal	22s
nix-build	47s
runghc	15s
unit-tests	12s
build-extra-hackages	20s
cabal-doExactConfig	16s
hix	31s
docs	33s
maintainer-scripts	14s
multi-target	40s
plan-extra-hackages	18s
shellFor-hoogle	18s
shellFor-multiple-package	25s
shellFor-not-depends	22s
shellFor-single-package	28s
tests-benchmarks	18s
check-materialization-concurrency	19s
check-path-support	6s
closure-size	3s
hydra-ifdLevel-0-and-1	33s
hydra-ifdLevel-2	18s
hydra-ifdLevel-3-and-ghc-8-10	18s
hydra-ifdLevel-3-and-ghc-9-2	18s
hydra-ifdLevel-3-and-not-ghc-8-10-or-9-2	20s
update-docs	4s
haskell-nix-roots-do-not-require-IFDs	4s
hix-cabal	7s
hydra-without-remote-builders-ghc8107	31s
hydra-without-remote-builders-ghc9101	26s
nix-tools	11s
	9m 57s

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