Fixes prim type promotion and updates type promotion testing
This PR fixes prim elementwise type promotion, tests elementwise binary references using `test_type_promotion` in the elementwise binary test suite, and updates that test with additional cases for float x complex and scalar type promotion.
The following issues were discovered while working on this PR:
- https://github.com/pytorch/pytorch/issues/76806
- https://github.com/pytorch/pytorch/issues/76805
- https://github.com/pytorch/pytorch/issues/76804
- https://github.com/pytorch/pytorch/issues/76803
- https://github.com/pytorch/pytorch/issues/76801
Pull Request resolved: https://github.com/pytorch/pytorch/pull/76809
Approved by: https://github.com/ngimel
