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/tests/libs/AWSNativeSDKTestManager.h

@@ -0,0 +1,39 @@
+/*
+ * Copyright (c) Contributors to the Open 3D Engine Project.
+ * For complete copyright and license terms please see the LICENSE at the root of this distribution.
+ *
+ * SPDX-License-Identifier: Apache-2.0 OR MIT
+ *
+ */
+
+#pragma once
+
+#include <AzCore/Module/Environment.h>
+#include <AzCore/PlatformIncl.h>
+
+#include <AWSNativeSDKInit/AWSMemoryInterface.h>
+
+#include <aws/core/Aws.h>
+
+namespace AWSNativeSDKTestLibs
+{
+    // Entry point for AWSNativeSDK's initialization and shutdown for test environment
+    // Use an AZ::Environment variable to enforce only one init and shutdown
+    class AWSNativeSDKTestManager
+    {
+    public:
+        static constexpr const char SdkManagerTag[] = "TestAWSSDKManager";
+
+        AWSNativeSDKTestManager();
+        ~AWSNativeSDKTestManager();
+
+        static void Init();
+        static void Shutdown();
+
+    private:
+        static AZ::EnvironmentVariable<AWSNativeSDKTestManager> s_sdkManager;
+
+        AWSNativeSDKInit::MemoryManager m_memoryManager;
+        Aws::SDKOptions m_awsSDKOptions;
+    };
+}