Remove 'show-build-info' from lib:Cabal

Hello everyone! The lib:Cabal (Setup.hs) command 'show-build-info' is going to be removed with the next Cabal version (3.8). It is being replaced by the build flag '--enable-build-info' that is added to 'build' directly. If you depend on 'show-build-info' in any way, please give us feedback on [1] or [2]. Details on the purpose and implementation of 'show-build-info' can be found here: [1] Best regards, Fendor [1]: https://github.com/haskell/cabal/issues/7489 [2]: https://github.com/haskell/cabal/pull/7498