COMP: Move CMake's include(ITKWindowsUtf8) for external modules

The inclusion in the root CMakeLists.txt was causing the following
configure error when compiling a module externally:

```
CMake Error at C:/src/itk/ITK-main/CMake/ITKModuleTest.cmake:93 (itk_target_attach_windows_utf8_manifest):
  Unknown CMake command "itk_target_attach_windows_utf8_manifest".
Call Stack (most recent call first):
  test/CMakeLists.txt:22 (createtestdriver)
```

Author: Simon Rit

CMake/ITKModuleTest.cmake

@@ -11,6 +11,8 @@
 #   KitTests - a list of tests to be included in the test driver
 #   ADDITIONAL_SRC (optional) - additional source files, which don't contain tests
 
+include(ITKWindowsUtf8)
+
 function(CreateTestDriver KIT KIT_LIBS KitTests)
   set(ADDITIONAL_SRC ${ARGN})
   if(EMSCRIPTEN)

CMakeLists.txt

@@ -180,7 +180,6 @@ include(PreventInSourceBuilds)
 include(PreventInBuildInstalls)
 include(ITKModuleMacros)
 include(ITKExternalData)
-include(ITKWindowsUtf8)
 include(ITKModuleTest)
 include(itkCheckSourceTree)