[tests] add `require_bitsandbytes` marker (#30116)

* add bnb flag

* move maker

* add accelerator maker

tests/models/persimmon/test_modeling_persimmon.py

@@ -23,6 +23,7 @@ from parameterized import parameterized
 from transformers import PersimmonConfig, is_torch_available, set_seed
 from transformers.testing_utils import (
     backend_empty_cache,
+    require_bitsandbytes,
     require_torch,
     require_torch_accelerator,
     require_torch_fp16,
@@ -465,6 +466,8 @@ class PersimmonModelTest(ModelTesterMixin, GenerationTesterMixin, PipelineTester
 @require_torch
 class PersimmonIntegrationTest(unittest.TestCase):
     @slow
+    @require_torch_accelerator
+    @require_bitsandbytes
     def test_model_8b_chat_logits(self):
         input_ids = [1, 306, 4658, 278, 6593, 310, 2834, 338]
         model = PersimmonForCausalLM.from_pretrained(
@@ -492,6 +495,7 @@ class PersimmonIntegrationTest(unittest.TestCase):
     @slow
     @require_torch_accelerator
     @require_torch_fp16
+    @require_bitsandbytes
     def test_model_8b_chat_greedy_generation(self):
         EXPECTED_TEXT_COMPLETION = """human: Simply put, the theory of relativity states that?\n\nadept: The theory of relativity states that the laws of physics are the same for all observers, regardless of their relative motion."""
         prompt = "human: Simply put, the theory of relativity states that?\n\nadept:"