Remove dup of index-state, no longer needed with latest haskell.nix #5026
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as of input-output-hk/haskell.nix#1903 haskell.nix (the nix part) does not parse the index-state so the duplication which was done for haskell.nix is no longer needed.
There is also a change to use hls from github (hence with access to the cabal.project) instead of hackage (which was breaking regularly), required due to input-output-hk/haskell.nix#1909