CI: avoid human error, automatically infer generative models (#33212)

* tmp commit

* move tests to the right class

* remove ALL all_generative_model_classes = ...

* skip tf roberta

* skip InstructBlipForConditionalGenerationDecoderOnlyTest

* videollava

* reduce diff

* reduce diff

* remove  on vlms

* fix a few more

* manual rebase bits

* more manual rebase

* remove all manual generative model class test entries

* fix up to ernie

* a few more removals

* handle remaining cases

* recurrent gemma

* it's better here

* make fixup

* tf idefics is broken

* tf bert + generate is broken

* don't touch tf :()

* don't touch tf :(

* make fixup

* better comments for test skips

* revert tf changes

* remove empty line removal

* one more

* missing one

tests/models/time_series_transformer/test_modeling_time_series_transformer.py

@@ -179,7 +179,6 @@ class TimeSeriesTransformerModelTest(ModelTesterMixin, PipelineTesterMixin, unit
     all_model_classes = (
         (TimeSeriesTransformerModel, TimeSeriesTransformerForPrediction) if is_torch_available() else ()
     )
-    all_generative_model_classes = (TimeSeriesTransformerForPrediction,) if is_torch_available() else ()
     pipeline_model_mapping = {"feature-extraction": TimeSeriesTransformerModel} if is_torch_available() else {}
     is_encoder_decoder = True
     test_pruning = False