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/test_modeling_flax_common.py

@@ -133,6 +133,10 @@ class FlaxModelTesterMixin:
     test_head_masking = False
     has_attentions = True
 
+    @property
+    def all_generative_model_classes(self):
+        return tuple(model_class for model_class in self.all_model_classes if model_class.can_generate())
+
     def _prepare_for_class(self, inputs_dict, model_class):
         inputs_dict = copy.deepcopy(inputs_dict)