Generate: TF contrastive search must pop `use_cache` from `model_kwargs` (#21149)

src/transformers/generation/tf_utils.py

@@ -2437,6 +2437,8 @@ class TFGenerationMixin:
             else self.generation_config.return_dict_in_generate
         )
         use_cache = True  # In contrastive search, we always use cache
+        model_kwargs.pop("use_cache", None)
+
         use_xla = not tf.executing_eagerly()
         # TODO (Joao): fix cache format or find programatic way to detect cache index
         # GPT2 and other models has a slightly different cache structure, with a different batch axis