[llvm] [mlir] [MLIR][Python] reland (narrower) type stub generation (PR #157930)

[Mehdi Amini via llvm-commits]

joker-eph wrote:

But why do we print this in the first place? This is neither an error nor a warning or anything that would require the user attention, or is it?

https://github.com/llvm/llvm-project/pull/157930