[Z-Image] various small changes, Z-Image transformer tests, etc. (#12741)
* start zimage model tests.
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* Revert "up"
This reverts commit bca3e27c96b942db49ccab8ddf824e7a54d43ed1.
* expand upon compilation failure reason.
* Update tests/models/transformers/test_models_transformer_z_image.py
Co-authored-by: dg845 <58458699+dg845@users.noreply.github.com>
* reinitialize the padding tokens to ones to prevent NaN problems.
* updates
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* skipping ZImage DiT tests
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Co-authored-by: dg845 <58458699+dg845@users.noreply.github.com>