Migrate away from calling cabal on file targets

[TeofilC]

In haskell/cabal#8966 cabal removed its support for file and module targets.
But these are currently used by hie-bios to determine the flags for components.
Perhaps we should just be calling cabal repl on the component instead?

See also the cabal issue: haskell/cabal#9688

[mpickering]

I think that the patch in cabal should be reverted. This has been how hie-bios has interacted with cabal-install since the start of the library and it has been a stable and robust interface.

If this feature is removed then there should be a long deprecation period to avoid breaking HLS users who have old version of hie-bios and a suitable migration implemented in hie-bios.

[fendor]

This cabal PR slipped past me, otherwise I would have voiced this concern much sooner. Thanks for catching this before the next cabal release!

[TeofilC]

I'll close this for now since it looks like the cabal PR is getting reverted