Revert "implement a function to convert a storage to copy-on-write (#100819)"
This reverts commit aec11b8c802617d87f54e7c2c0ffe96e33657b2c.
Reverted https://github.com/pytorch/pytorch/pull/100819 on behalf of https://github.com/jeanschmidt due to added tests are breaking internal builds ([comment](https://github.com/pytorch/pytorch/pull/100819#issuecomment-1547929531))
