Improve error message in `exitFailure` method

For debugging purposes would be great if this method could print the full command run, not just the name of the executable. For example:

testProgram "Foo" "ghc" ["-fforce-recomp", "foo.hs"] Nothing

would print:

Program `/home/matthew/.ghc/ghc --fforce-recomp foo.hs` failed with code 42

rather than

Program /home/matthew/.ghc/ghc failed with code 42

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This is useful when you are computing the arguments rather than hard-coding them. This could be hidden behind an option if you don’t think it’s generally desirable.

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Again would open a PR if I had permission.

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