fix type promotion for div in RemoveMixedTypeOperators #12157
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The promotion strategy is dependent on the rounding mode (see the div
decomp in PyTorch
https://github.com/pytorch/pytorch/blob/main/torch/_refs/__init__.py#L1214
and then the promotion annotation on each of the
true_divide/trunc_divide/floor_divide functions itcalls).
I had to restructure the test a bit more so that lint didn't complain it was too complex.