CSC/BSC -> COO coalesce fix (#91440)
Fixes https://github.com/pytorch/pytorch/issues/91010.
CSC and BSC sparse formats are not inherently `coalesced`.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/91440
Approved by: https://github.com/pearu, https://github.com/amjames, https://github.com/cpuhrsch
