[Testing] Allow optional experimental module test to be skipped

Signed-off-by: Jay Gu <jagu@nvidia.com>

Author: haijieg

experimental/cuda-lang/test/conftest.py

@@ -0,0 +1,7 @@
+# SPDX-FileCopyrightText: Copyright (c) <2026> NVIDIA CORPORATION & AFFILIATES. All rights reserved.
+#
+# SPDX-License-Identifier: Apache-2.0
+
+import pytest
+
+pytest.importorskip("cuda.lang", reason="Skipping cuda-lang test: module not found")