Fix python fbx tests (#2171)

* Update fbx test dbgsg files

Remove rc products from fbx test expected output
Update warning counts for 2 of the tests - these are due to missing material properties
Add SkipAtomOutput setting to disable atom material and mesh processing in scene as these pull in a lot of external dependencies to Process
Removed BlendShapeData and MeshData debug output of positions/normals/faces
Updated ManifestImportRequestHandler to remove warning about Joining 2 absolute paths
Updated AssImpMaterialImporter to use new GenerateRelativeSourcePath API to fix issue where relative path generation failed with tmp project directories

Signed-off-by: amzn-mike <80125227+amzn-mike@users.noreply.github.com>

* Add comment for setting

Signed-off-by: amzn-mike <80125227+amzn-mike@users.noreply.github.com>

* Add override dbgsg file to python test

The mesh optimizer specifically avoids creating optimized nodes for nodes that are not selected, resulting in a different scene graph that requires a different dbgsg file to compare with

Signed-off-by: amzn-mike <80125227+amzn-mike@users.noreply.github.com>

* Replace hardcoded passing of specific registry setting to instead pass all registry settings to AssetBuilder

Signed-off-by: amzn-mike <80125227+amzn-mike@users.noreply.github.com>

AutomatedTesting/Gem/PythonTests/automatedtesting_shared/asset_database_utils.py

@@ -89,13 +89,13 @@ def clear_all_missing_dependencies(asset_db_path) -> None:
 class DBProduct:
     product_name: str = None
     sub_id: int = 0
-    asset_type: str = None
+    asset_type: bytes = None
 
 
 @dataclass
 class DBJob:
     job_key: str = None
-    builder_guid: str = None
+    builder_guid: bytes = None
     status: int = 0
     error_count: int = 0
     warning_count: int = 0
@@ -107,7 +107,7 @@ class DBJob:
 @dataclass
 class DBSourceAsset:
     source_file_name: str = None
-    uuid: str = None
+    uuid: bytes = None
     scan_folder_key: str = field(compare=False, default=None)
     id: str = field(compare=False, default=None)
     # Key: Job ID