Improve error messages if cabal invocation fails

[fendor]

Turns this:

Cradle failed to load
Deps: ["hie-bios.cabal","cabal.project","cabal.project.local"]
Exit Code: ExitFailure 1
Stderr: Failed to parse result of calling cabal

Warning: cannot determine version of
/home/hugin/.cache/hie-bios/wrapper-b54f81dea4c0e6d1626911c526bc4e36 :
""
cabal: The program 'ghc' version >=7.0.1 is required but the version of
/home/hugin/.cache/hie-bios/wrapper-b54f81dea4c0e6d1626911c526bc4e36 could not
be determined.

into this:

Cradle failed to load
Deps: ["hie-bios.cabal","cabal.project","cabal.project.local"]
Exit Code: ExitFailure 1
Stderr: Failed to parse result of calling cabal
Failed command: cabal --builddir=/home/hugin/.cache/hie-bios/dist-hie-bios-e7a73b2ffd58a3db6a855ec871bcd65b v2-repl --with-compiler /home/hugin/.cache/hie-bios/wrapper-b54f81dea4c0e6d1626911c526bc4e36 --with-hc-pkg /home/hugin/.cache/hie-bios/ghc-pkg-58f7a37e9d8fd141faa884453f82f93a tests/BiosTests.hs

Warning: cannot determine version of
/home/hugin/.cache/hie-bios/wrapper-b54f81dea4c0e6d1626911c526bc4e36 :
""
cabal: The program 'ghc' version >=7.0.1 is required but the version of
/home/hugin/.cache/hie-bios/wrapper-b54f81dea4c0e6d1626911c526bc4e36 could not
be determined.



Process Environment:
HIE_BIOS_GHC: /home/hugin/.ghcup/ghc/8.10.7/lib/ghc-8.10.7/bin/ghcit :: ()
HIE_BIOS_GHC_ARGS: -B/home/hugin/.ghcup/ghc/8.10.7/lib/ghc-8.10.7

note the new command that failed to execute and the content of environment variables that hie-bios manages.