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/pegasus/test_modeling_pegasus.py

@@ -235,7 +235,6 @@ class PegasusModelTester:
 @require_torch
 class PegasusModelTest(ModelTesterMixin, GenerationTesterMixin, PipelineTesterMixin, unittest.TestCase):
     all_model_classes = (PegasusModel, PegasusForConditionalGeneration) if is_torch_available() else ()
-    all_generative_model_classes = (PegasusForConditionalGeneration,) if is_torch_available() else ()
     pipeline_model_mapping = (
         {
             "feature-extraction": PegasusModel,
@@ -562,7 +561,6 @@ class PegasusStandaloneDecoderModelTester:
 @require_torch
 class PegasusStandaloneDecoderModelTest(ModelTesterMixin, GenerationTesterMixin, unittest.TestCase):
     all_model_classes = (PegasusDecoder, PegasusForCausalLM) if is_torch_available() else ()
-    all_generative_model_classes = (PegasusForCausalLM,) if is_torch_available() else ()
     test_resize_position_embeddings = True
     test_pruning = False
     is_encoder_decoder = False