Reland "[MLIR][FuncToLLVM] Remove typed pointer support" (#70717)

This relands 6a0f6dd8 that was reverted
due to a missing integration test change.
 
This commit removes the support for lowering Func to LLVM dialect with
typed pointers. Typed pointers have been deprecated for a while now and
it's planned to soon remove them from the LLVM dialect.

Original PR: https://github.com/llvm/llvm-project/pull/70574