[sparsity] Convert function for sparse kernels without a context manager (#66778)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/66778
This removes the hack of the context manager that would communicate the zeros block shape to the quantization convert.
The conversion will assume that the converted modules have `sparse_params` (which is added by the sparsifier).
Test Plan: Imported from OSS
Reviewed By: mrshenli
Differential Revision: D31835721
Pulled By: z-a-f
fbshipit-source-id: c5fd2da3b09a728a2296765c00ca69275dbca3b1
