Revert "Implement `mul(dense, sparse), mul(sparse, dense)` for sparse COO tensors. (#81556)"
This reverts commit cc5b01651f9d34fa05363c955aa487ffcc0e29d1.
Reverted https://github.com/pytorch/pytorch/pull/81556 on behalf of https://github.com/jeanschmidt due to breaking internal builds
