Add XR sample assets and update settings

ProjectSettings/EditorBuildSettings.asset

@@ -5,12 +5,16 @@ EditorBuildSettings:
   m_ObjectHideFlags: 0
   serializedVersion: 2
   m_Scenes:
-  - enabled: 1
+  - enabled: 0
     path: Assets/Scenes/SampleScene.unity
     guid: 99c9720ab356a0642a771bea13969a05
+  - enabled: 1
+    path: Assets/Scenes/TestArea.unity
+    guid: 1fa8205536b2f5b42a11ca1c26adf810
   m_configObjects:
     com.unity.dt.app-ui: {fileID: 11400000, guid: 1b1c20d82303e4b5781c3ef50ac1449f, type: 2}
     com.unity.input.settings.actions: {fileID: -944628639613478452, guid: 052faaac586de48259a63d0c4782560b, type: 3}
     com.unity.xr.arfoundation.simulation_settings: {fileID: 11400000, guid: 259d3ad4b6eeaa3378559ced8c31a7d2, type: 2}
+    com.unity.xr.management.loader_settings: {fileID: 11400000, guid: b5caba342dc44f808b0b160addbc4aa4, type: 2}
     com.unity.xr.openxr.settings4: {fileID: 11400000, guid: 12bf1d9a7e4890d229eaf5a10886d34e, type: 2}
   m_UseUCBPForAssetBundles: 0