Don't accidentally mutate the base_model_tp_plan (#36677)

* Don't accidentally mutate the base_model_tp_plan

* Co-authored by: Joao Gante <joaofranciscocardosogante@gmail.com>

* Trigger tests

* Marking grad accum test as slow

* Add a flaky decorator

* Add a flaky decorator

* Use cyril's codeblock

* Don't copy() when it's None

* Use cyril's new codeblock

* make fixup

tests/generation/test_utils.py

@@ -2305,6 +2305,7 @@ class GenerationTesterMixin:
             self.assertEqual(with_all_logits.tolist(), without_all_logits.tolist())
 
     @pytest.mark.generate
+    @is_flaky
     def test_assisted_decoding_with_logits_to_keep(self):
         for model_class in self.all_generative_model_classes:
             if "logits_to_keep" not in set(inspect.signature(model_class.forward).parameters.keys()):