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* Compute loss independent from decoder (as 14139)

* fix expected seq_len + style

* Apply the same change to TFVisionEncoderDecoderModel

* fix style

* Add case with labels in equivalence test

* uncomment

* Add case with labels in equivalence test

* add decoder_token_labels

* use hf_compute_loss

* Apply suggestions from code review
Co-authored-by: NielsRogge <48327001+NielsRogge@users.noreply.github.com>

* Add copied from
Co-authored-by: ydshieh <ydshieh@users.noreply.github.com>
Co-authored-by: NielsRogge <48327001+NielsRogge@users.noreply.github.com>