[CI/Build] Add experimental AMD MI300 nightly lane (#6978)

Signed-off-by: andyluo7 <andy.luo@amd.com>

.buildkite/common/scripts/skip_ci.py

@@ -44,6 +44,7 @@ L3_YAML_FILES: dict[str, str] = {
 L45_YAML_FILES: dict[str, str] = {
     ".buildkite/cuda/test-nightly.yml": "cuda",
     ".buildkite/cuda/test-weekly.yml": "cuda",
+    ".buildkite/amd/test-amd-nightly.yml": "amd",
     ".buildkite/npu/test-npu-nightly.yml": "npu",
 }