Tidy up scenes

Remove point cloud and plane visualization in the Light Estimation scene
Remove ARPointCloudManager from FeatheredPlane sample (it was disabled).
Remove "scene" postfix from scene names.

Assets/Scenes/LightEstimation.unity

   m_ReflectionIntensity: 1
   m_CustomReflection: {fileID: 0}
   m_Sun: {fileID: 0}
-  m_IndirectSpecularColor: {r: 0.44657868, g: 0.49641263, b: 0.5748171, a: 1}
+  m_IndirectSpecularColor: {r: 0.44657898, g: 0.4964133, b: 0.5748178, a: 1}
   m_UseRadianceAmbientProbe: 0
 --- !u!157 &3
 LightmapSettings:
   m_Component:
   - component: {fileID: 1335839535}
   - component: {fileID: 1335839534}
-  - component: {fileID: 1335839537}
-  - component: {fileID: 1335839536}
   - component: {fileID: 1335839538}
   m_Layer: 0
   m_Name: AR Session Origin
   m_Father: {fileID: 0}
   m_RootOrder: 2
   m_LocalEulerAnglesHint: {x: 0, y: 0, z: 0}
---- !u!114 &1335839536
-MonoBehaviour:
-  m_ObjectHideFlags: 0
-  m_CorrespondingSourceObject: {fileID: 0}
-  m_PrefabInstance: {fileID: 0}
-  m_PrefabAsset: {fileID: 0}
-  m_GameObject: {fileID: 1335839533}
-  m_Enabled: 1
-  m_EditorHideFlags: 0
-  m_Script: {fileID: 11500000, guid: 7ab0e80cee9cc1d44928bfe488dd1e2d, type: 3}
-  m_Name: 
-  m_EditorClassIdentifier: 
-  m_PointCloudPrefab: {fileID: 1854016325464908, guid: 0d4f49e744bffd14eb527ba76c9bba12,
-    type: 3}
---- !u!114 &1335839537
-MonoBehaviour:
-  m_ObjectHideFlags: 0
-  m_CorrespondingSourceObject: {fileID: 0}
-  m_PrefabInstance: {fileID: 0}
-  m_PrefabAsset: {fileID: 0}
-  m_GameObject: {fileID: 1335839533}
-  m_Enabled: 1
-  m_EditorHideFlags: 0
-  m_Script: {fileID: 11500000, guid: e1760703bbd54c04488a8d10600262ab, type: 3}
-  m_Name: 
-  m_EditorClassIdentifier: 
-  m_PlanePrefab: {fileID: 1568414836858200, guid: f0e0be81472ff1243aa2afa27e5d0e61,
-    type: 3}
-  m_DetectionFlags: -1
 --- !u!114 &1335839538
 MonoBehaviour:
   m_ObjectHideFlags: 0

Assets/Scenes/Plane Detection/FeatheredPlanes.unity

   m_ReflectionIntensity: 1
   m_CustomReflection: {fileID: 0}
   m_Sun: {fileID: 0}
-  m_IndirectSpecularColor: {r: 0.44657868, g: 0.49641263, b: 0.5748171, a: 1}
+  m_IndirectSpecularColor: {r: 0.44657898, g: 0.4964133, b: 0.5748178, a: 1}
   m_UseRadianceAmbientProbe: 0
 --- !u!157 &3
 LightmapSettings:
   - component: {fileID: 1335839535}
   - component: {fileID: 1335839534}
   - component: {fileID: 1335839537}
-  - component: {fileID: 1335839536}
   m_Layer: 0
   m_Name: AR Session Origin
   m_TagString: Untagged
   m_Father: {fileID: 0}
   m_RootOrder: 2
   m_LocalEulerAnglesHint: {x: 0, y: 0, z: 0}
---- !u!114 &1335839536
-MonoBehaviour:
-  m_ObjectHideFlags: 0
-  m_CorrespondingSourceObject: {fileID: 0}
-  m_PrefabInstance: {fileID: 0}
-  m_PrefabAsset: {fileID: 0}
-  m_GameObject: {fileID: 1335839533}
-  m_Enabled: 0
-  m_EditorHideFlags: 0
-  m_Script: {fileID: 11500000, guid: 7ab0e80cee9cc1d44928bfe488dd1e2d, type: 3}
-  m_Name: 
-  m_EditorClassIdentifier: 
-  m_PointCloudPrefab: {fileID: 1854016325464908, guid: 0d4f49e744bffd14eb527ba76c9bba12,
-    type: 3}
 --- !u!114 &1335839537
 MonoBehaviour:
   m_ObjectHideFlags: 0