[CI] Skip tests failing on main (#25326)

Signed-off-by: Woosuk Kwon <woosuk.kwon@berkeley.edu>

tests/quantization/test_compressed_tensors.py

@@ -357,6 +357,9 @@ def test_compressed_tensors_fp8(vllm_runner):
         assert output
 
 
+@pytest.mark.skipif(
+    not current_platform.is_kv_cache_dtype_supported("fp8", None),
+    reason="FP8 KV cache is not supported on this device.")
 @pytest.mark.skipif(not current_platform.is_cuda(),
                     reason="This test is skipped on non-CUDA platform.")
 def test_compressed_tensors_kv_cache(vllm_runner):
@@ -738,4 +741,4 @@ def test_compressed_tensors_transforms_perplexity(vllm_runner, model, prompt,
     with vllm_runner(model, enforce_eager=True) as llm:
         perplexity = llm.generate_prompt_perplexity([prompt])[0]
         print(perplexity)
-        assert perplexity <= exp_perplexity
+        assert perplexity <= exp_perplexity