[MPS] Extend unary ops to int64 (#86615)
Most of them are already supported for `int64` except for:
- rounding operations (`floor`, `ceil` and `round`), which are no-ops for integral types anyway
- sign operation, when it can be emulated by clamping it tensor to [-1, 1] range
Test new types by test MPS
Fixes https://github.com/pytorch/pytorch/issues/86319
Pull Request resolved: https://github.com/pytorch/pytorch/pull/86615
Approved by: https://github.com/DenisVieriu97, https://github.com/huydhn
