[test] update test_past_key_values_format (#37614)

allow custom shapes

tests/models/got_ocr2/test_modeling_got_ocr2.py

@@ -222,12 +222,6 @@ class GotOcr2ModelTest(ModelTesterMixin, GenerationTesterMixin, PipelineTesterMi
     def test_generate_from_inputs_embeds_with_static_cache(self):
         pass
 
-    @unittest.skip(
-        reason="GotOcr2's language backbone is Qwen2 which uses GQA so the KV cache is a non standard format"
-    )
-    def test_past_key_values_format(self):
-        pass
-
     @unittest.skip("FlashAttention only support fp16 and bf16 data type")
     def test_flash_attn_2_fp32_ln(self):
         pass