Add SetEnv and UnSetEnv for environment variable to util (#6884)

* Add SetEnv and UnSetEnv for environment variable to util
* Move utils to AzTest
* enable for ios and android
* fix wrong file path

Code/Framework/AzTest/AzTest/Platform/Android/platform_android_files.cmake

@@ -8,6 +8,7 @@
 
 set(FILES
     ../Common/UnixLike/AzTest/ColorizedOutput_UnixLike.cpp
+    ../Common/UnixLike/AzTest/Utils_UnixLike.cpp
     ScopedAutoTempDirectory_Android.cpp
     Platform_Android.cpp
     AzTest_Traits_Platform.h

Code/Framework/AzTest/AzTest/Platform/Common/Unimplemented/AzTest/Utils_Unimplemented.cpp

@@ -0,0 +1,25 @@
+/*
+ * 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
+ *
+ */
+
+#include <AzTest/Utils.h>
+
+namespace AZ
+{
+    namespace Test
+    {
+        bool SetEnv([[maybe_unused]] const char* envname, [[maybe_unused]] const char* envvalue, [[maybe_unused]] bool overwrite)
+        {
+            return false;
+        }
+
+        bool UnsetEnv([[maybe_unused]] const char* envname)
+        {
+            return false;
+        }
+    } // namespace Test
+} // namespace AZ

Code/Framework/AzTest/AzTest/Platform/Common/UnixLike/AzTest/Utils_UnixLike.cpp

@@ -0,0 +1,25 @@
+/*
+ * 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
+ *
+ */
+
+#include <AzTest/Utils.h>
+
+namespace AZ
+{
+    namespace Test
+    {
+        bool SetEnv(const char* envname, const char* envvalue, bool overwrite)
+        {
+            return setenv(envname, envvalue, overwrite) != -1;
+        }
+
+        bool UnsetEnv(const char* envname)
+        {
+            return unsetenv(envname) != -1;
+        }
+    }
+}

Code/Framework/AzTest/AzTest/Platform/Common/WinAPI/AzTest/Utils_WinAPI.cpp

@@ -0,0 +1,25 @@
+/*
+ * 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
+ *
+ */
+
+#include <AzTest/Utils.h>
+
+namespace AZ
+{
+    namespace Test
+    {
+        bool SetEnv(const char* envname, const char* envvalue, [[maybe_unused]] bool overwrite)
+        {
+            return _putenv_s(envname, envvalue);
+        }
+
+        bool UnsetEnv(const char* envname)
+        {
+            return SetEnv(envname, "", 1);
+        }
+    }
+}

Code/Framework/AzTest/AzTest/Platform/Linux/platform_linux_files.cmake

@@ -9,6 +9,7 @@
 set(FILES
     ../Common/UnixLike/AzTest/ColorizedOutput_UnixLike.cpp
     ../Common/UnixLike/AzTest/ScopedAutoTempDirectory_UnixLike.cpp
+    ../Common/UnixLike/AzTest/Utils_UnixLike.cpp
     Platform_Linux.cpp
     AzTest_Traits_Platform.h
     AzTest_Traits_Linux.h

Code/Framework/AzTest/AzTest/Platform/Mac/platform_mac_files.cmake

@@ -9,6 +9,7 @@
 set(FILES
     ../Common/UnixLike/AzTest/ColorizedOutput_UnixLike.cpp
     ../Common/UnixLike/AzTest/ScopedAutoTempDirectory_UnixLike.cpp
+    ../Common/UnixLike/AzTest/Utils_UnixLike.cpp
     Platform_Mac.cpp
     AzTest_Traits_Platform.h
     AzTest_Traits_Mac.h

Code/Framework/AzTest/AzTest/Platform/Windows/platform_windows_files.cmake

@@ -8,6 +8,7 @@
 
 set(FILES
     ../Common/WinAPI/AzTest/ColorizedOutput_WinAPI.cpp
+    ../Common/WinAPI/AzTest/Utils_WinAPI.cpp
     Platform_Windows.cpp
     ScopedAutoTempDirectory_Windows.cpp
     AzTest_Traits_Platform.h

Code/Framework/AzTest/AzTest/Platform/iOS/platform_ios_files.cmake

@@ -9,6 +9,7 @@
 set(FILES
     ../Common/UnixLike/AzTest/ColorizedOutput_UnixLike.cpp
     ../Common/Unimplemented/AzTest/ScopedAutoTempDirectory_Unimplemented.cpp
+    ../Common/UnixLike/AzTest/Utils_UnixLike.cpp
     Platform_iOS.cpp
     AzTest_Traits_Platform.h
     AzTest_Traits_iOS.h

Code/Framework/AzTest/AzTest/Utils.h

@@ -55,6 +55,19 @@ namespace AZ
         // Returns the path to the engine's root by cdup from the current execution path until engine.txt is found
         AZStd::string GetEngineRootPath();
 
+        //! Create or modify environment variable.
+        //! @param envname The environment variable name
+        //! @param envvalue The environment variable name
+        //! @param overwrite If name does exist in the environment, then its value is changed to value if overwrite is nonzero;
+        //! if overwrite is zero, then the value of name is not changed
+        //! @returns Return true if successful, otherwise false
+        bool SetEnv(const char* envname, const char* envvalue, bool overwrite);
+
+        //! Remove environment variable.
+        //! @param envname The environment variable name
+        //! @returns Return true if successful, otherwise false
+        bool UnsetEnv(const char* envname);
+
         //! Provides a scoped object that will create a temporary operating-system specific folder on creation, and delete it and 
         //! its contents on destruction. This class is only available on host platforms (Windows, Mac, and Linux)
         class ScopedAutoTempDirectory