[mlir][sparse] remove vector support in sparsification

Sparse compiler used to generate vectorized code for sparse tensors computation, but it should really be delegated to other vectorization passes for better progressive lowering.

 https://discourse.llvm.org/t/rfc-structured-codegen-beyond-rectangular-arrays/64707

Reviewed By: aartbik

Differential Revision: https://reviews.llvm.org/D136183