Silence aws logging for unit test and have a new AWSNativeSDK as entry point for test env (#6865)

* Silence aws logging for unit test
* Create a new AWSNativeSDK entry point for test environment only
* Update naming for target and file

Code/Tools/AWSNativeSDKInit/source/AWSNativeSDKInit.cpp

@@ -89,5 +89,4 @@ namespace AWSNativeSDKInit
         Platform::CustomizeShutdown();
 #endif // #if defined(PLATFORM_SUPPORTS_AWS_NATIVE_SDK)
     }
-
 }