[mlir][bufferization] Remove cleanup pipeline from bufferization pass

[mlir][bufferization] Remove cleanup pipeline from bufferization pass

To keep the pass simple, users should apply cleanup passes manually when necessary. In particular, `-cse -canonicalize` are often desireable to fold away self-copies that are created by the bufferization.

This addresses a comment in D120191.

Differential Revision: https://reviews.llvm.org/D155923