Fix LEAPP env YAML test loading

Author: frlai

source/isaaclab_rl/test/export/test_leapp_export_flow.py

@@ -260,7 +260,7 @@ def _assert_leapp_artifacts(export_root: Path, task_name: str) -> None:
 
     env_path = export_dir / "env.yaml"
     assert env_path.is_file(), f"Missing env.yaml in {export_dir}"
-    env = yaml.safe_load(env_path.read_text(encoding="utf-8"))
+    env = yaml.full_load(env_path.read_text(encoding="utf-8"))
     assert policy_frequency == pytest.approx(1.0 / (env["sim"]["dt"] * env["decimation"]))
 
 

source/isaaclab_rl/test/export/test_rsl_rl_direct_export_flow.py

@@ -196,7 +196,7 @@ def test_direct_env_export_flow():
     with open(yaml_path, encoding="utf-8") as stream:
         graph = yaml.safe_load(stream)
     with open(env_yaml_path, encoding="utf-8") as stream:
-        env = yaml.safe_load(stream)
+        env = yaml.full_load(stream)
     assert graph["pipeline"]["configs"]["frequency"] == pytest.approx(1.0 / (env["sim"]["dt"] * env["decimation"]))