{lyn9996} fixes for the default procedural prefab (#7354)

* {lyn9996} adding a default transform for procprefab

adding a default transform for procprefab when the DCC transform is
also a default transform. The import logic is not to create a
transform data node unless there is a delta.

Signed-off-by: Allen Jackson <23512001+jackalbe@users.noreply.github.com>

* cleaning up the code


Signed-off-by: Allen Jackson <23512001+jackalbe@users.noreply.github.com>

* adding unique optimized mesh entries using Mesh Group + Mesh Name
adding blank LOD rule to skip that logic for default proc prefab
unique mesh group names based on file name

Signed-off-by: Allen Jackson <23512001+jackalbe@users.noreply.github.com>

* updated a comment
bumped the scene builder version number
fixed up the mesh asset path for azmodel assets

Signed-off-by: Allen Jackson <23512001+jackalbe@users.noreply.github.com>

* update the proc prefab unit tests

Signed-off-by: Allen Jackson <23512001+jackalbe@users.noreply.github.com>

* fixing SceneProcessing MeshOptimizerComponentTests due to the name changes
in the mesh opt mesh group names now


Signed-off-by: Allen Jackson <23512001+jackalbe@users.noreply.github.com>

Gems/SceneProcessing/Code/Source/SceneBuilder/SceneBuilderWorker.cpp

@@ -79,7 +79,7 @@ namespace SceneBuilder
                 m_cachedFingerprint.append(element);
             }
             // A general catch all version fingerprint. Update this to force all FBX files to recompile.
-            m_cachedFingerprint.append("Version 2");
+            m_cachedFingerprint.append("Version 3");
         }
 
         return m_cachedFingerprint.c_str();