♾️ [CI] Remove test_raise_error_not_causallm

[qgallouedec]

This PR huggingface/transformers#37173 removes GenerationMixin inheritance by default in PreTrainedModel. Consequently, AutoModel now returns object without method prepare_inputs_for_generation.

This line:

trl/trl/models/modeling_base.py

Line 91 in 1d7b8c4

self.prepare_inputs_for_generation = pretrained_model.prepare_inputs_for_generation

causes a premature error in this test test_modeling_value_head.py::Seq2SeqValueHeadModelTester::test_raise_error_not_causallm

trl/tests/test_modeling_value_head.py

Lines 384 to 390 in 1d7b8c4

	def test_raise_error_not_causallm(self):
	# Test with a model without a LM head
	model_id = "trl-internal-testing/tiny-T5ForConditionalGeneration"
	# This should raise a ValueError
	with self.assertRaises(ValueError):
	pretrained_model = AutoModel.from_pretrained(model_id)
	_ = self.trl_model_class.from_pretrained(pretrained_model)

which is bound to fail anyway, because that's what we're testing.

I propose to remove this test, which in fact tests a part of the codebase that is very little used, with a model that is also very little used.

[HuggingFaceDocBuilderDev]

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[shirinyamani]

I see the error is not related to this PR, apparently bc of the release