Add --with-repl flag to modify program the "repl" starts with

[mpickering]

Programs like doctest and hie-bios want to use cabal-install in order
to discover the correct options to start a GHC session. Previously they
used the --with-compiler option, but this led to complications since
the wrapper was called for compiling all dependencies and so on, the
shim had to be more complicated and forward arguments onto the user's
version of GHC.

The --with-repl command allows you to pass a program which is used
instead of GHC at the final invocation of the repl. Therefore the
wrappers don't have to deal with being a complete shim but can
concentrate on intercepting the arguments at the end.

This commit removes the special hack to not use response files with
--interactive mode. Tools are expected to deal with them appropiately,
which is much easier now only one invocation is passed to the wrapper.

Fixes #9115

---

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[mpickering]

@sol @fendor Can you please test this patch works for your use case?

TODO

• Documentation
• Changelog

[fendor]

haskell/hie-bios#466

> hie-bios debug src/HIE/Bios.hs                                                                                                       
Root directory:        /home/hugin/Documents/haskell/hie-bios
Component directory:   /home/hugin/Documents/haskell/hie-bios
GHC options:           @/tmp/ghci84462-0.rsp
GHC library directory: CradleSuccess "/home/hugin/.ghcup/ghc/9.6.7/lib/ghc-9.6.7/lib"
GHC version:           CradleSuccess "9.6.7"
Config Location:       No explicit config found
Cradle:                Cradle{ cradleRootDir = "/home/hugin/Documents/haskell/hie-bios", cradleOptsProg = CradleAction: Cabal}
Dependencies:          hie-bios.cabal cabal.project cabal.project.local

The branch passes the test-suite with the cabal binary from this branch.