Use updated ONNX license in ThirdPartyNotices.txt. (microsoft#13919)

Use updated ONNX license in ThirdPartyNotices.txt. It got changed to the Apache license.
Copied LICENSE file content from onnx submodule at cmake/external/onnx.

Author: edgchen1

ThirdPartyNotices.txt

@@ -210,18 +210,207 @@ Open Neural Network Exchange
 
 Copyright (c) Facebook, Inc. and Microsoft Corporation. All rights reserved.
 
-MIT License
+                                 Apache License
+                           Version 2.0, January 2004
+                        http://www.apache.org/licenses/
 
-Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the ""Software""), to deal in the
-Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software,
-and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
+   TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
 
-The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
+   1. Definitions.
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 _____