[Misc] Fix Current vLLM config is not set. warnings, assert to avoid issues in the future (#31747)

Signed-off-by: Lucas Wilkinson <lwilkins@redhat.com>
Signed-off-by: Lucas Wilkinson <LucasWilkinson@users.noreply.github.com>
Co-authored-by: Luka Govedič <ProExpertProg@users.noreply.github.com>

tests/kernels/test_fused_quant_activation.py

@@ -39,6 +39,7 @@ def ops_impl(x: torch.Tensor, scale: torch.Tensor) -> torch.Tensor:
 @pytest.mark.parametrize("device", CUDA_DEVICES)
 @torch.inference_mode()
 def test_silu_and_mul(
+    default_vllm_config,
     num_tokens: int,
     hidden_size: int,
     dtype: torch.dtype,