Update to use AWSNativeSDK 1.9.50 (#6618)

* Update to use AWSNativeSDK 1.9.50
* After SDK upgrade, some AWS objects are bound to SDK allocator, init AWS SDK for unit test

Code/Tools/AWSNativeSDKInit/include/AWSNativeSDKInit/AWSLogSystemInterface.h

@@ -10,7 +10,7 @@
 
 #if defined(PLATFORM_SUPPORTS_AWS_NATIVE_SDK)
 
-#include <AzCore/PlatformDef.h>
+#include <AzCore/PlatformIncl.h>
 
 AZ_PUSH_DISABLE_WARNING(4251 4996, "-Wunknown-warning-option")
 #include <aws/core/utils/logging/LogSystemInterface.h>

Code/Tools/AWSNativeSDKInit/include/AWSNativeSDKInit/AWSMemoryInterface.h

@@ -8,6 +8,7 @@
 
 #pragma once
 
+#include <AzCore/PlatformIncl.h>
 #if defined(PLATFORM_SUPPORTS_AWS_NATIVE_SDK)
 #include <aws/core/utils/memory/MemorySystemInterface.h>
 #else

Code/Tools/AWSNativeSDKInit/include/AWSNativeSDKInit/AWSNativeSDKInit.h

@@ -13,7 +13,7 @@
 #include <AzCore/Module/Environment.h>
 
 #if defined(PLATFORM_SUPPORTS_AWS_NATIVE_SDK)
-
+#include <AzCore/PlatformIncl.h>
 // The AWS Native SDK AWSAllocator triggers a warning due to accessing members of std::allocator directly.
 // AWSAllocator.h(70): warning C4996: 'std::allocator<T>::pointer': warning STL4010: Various members of std::allocator are deprecated in C++17.
 // Use std::allocator_traits instead of accessing these members directly.