Revert "Add pixel_shuffle to core aten decomps (#119899)"
This reverts commit 9201d7335a25d9a91e10c1914c399419af0bd7c3.
Reverted https://github.com/pytorch/pytorch/pull/119899 on behalf of https://github.com/huydhn due to Sorry for reverting your change but keep the diff D53766709 around while investigating the failed tests is not a good practice and could lead to out of sync issue, so it is better to revert and reland this ([comment](https://github.com/pytorch/pytorch/pull/119899#issuecomment-1948970686))
