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/modernbert/test_modeling_modernbert.py

@@ -229,7 +229,6 @@ class ModernBertModelTest(ModelTesterMixin, GenerationTesterMixin, PipelineTeste
         if is_torch_available()
         else ()
     )
-    all_generative_model_classes = ()
     pipeline_model_mapping = (
         {
             "feature-extraction": ModernBertModel,