🚨 No more default chat templates (#31733)

* No more default chat templates

* Add the template to the GPT-SW3 tests since it's not available by default now

* Fix GPT2 test

* Fix Bloom test

* Fix Bloom test

* Remove default templates again

tests/models/gpt2/test_tokenization_gpt2.py

@@ -280,6 +280,7 @@ class GPT2TokenizationTest(TokenizerTesterMixin, unittest.TestCase):
     @require_jinja
     def test_tokenization_for_chat(self):
         tokenizer = GPT2Tokenizer.from_pretrained(self.tmpdirname)
+        tokenizer.chat_template = "{% for message in messages %}{{ message.content }}{{ eos_token }}{% endfor %}"
         test_chats = [
             [{"role": "system", "content": "You are a helpful chatbot."}, {"role": "user", "content": "Hello!"}],
             [