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

[Maksim Levental via llvm-commits]

makslevental wrote:

> It seems that this brought back the verbose logging in the build output:

only the first time right? the dep files are being written successfully 

<img width="354" height="221" alt="image" src="https://github.com/user-attachments/assets/4d637a70-82a4-41b4-80e2-043d3ece62db" />

so you should only see this on a clean build.

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