[cpack_installer] reworked how packaging is enabled for windows

scripts/build/Platform/Windows/build_config.json

@@ -314,8 +314,7 @@
     "PARAMETERS": {
         "CONFIGURATION": "profile",
         "OUTPUT_DIRECTORY": "build\\windows_vs2019",
-        "CMAKE_OPTIONS": "-G \"Visual Studio 16 2019\" -DCMAKE_SYSTEM_VERSION=10.0 -DLY_UNITY_BUILD=TRUE -DLY_DISABLE_TEST_MODULES=TRUE",
-        "CMAKE_INCLUDE_WIX": "True",
+        "CMAKE_OPTIONS": "-G \"Visual Studio 16 2019\" -DCMAKE_SYSTEM_VERSION=10.0 -DLY_UNITY_BUILD=TRUE -DLY_DISABLE_TEST_MODULES=TRUE -DCPACK_WIX_ROOT=\"!WIX!\"",
         "CMAKE_LY_PROJECTS": "",
         "CMAKE_TARGET": "ALL_BUILD",
         "CMAKE_NATIVE_BUILD_ARGS": "/m /nologo"

scripts/build/Platform/Windows/build_windows.cmd

@@ -38,14 +38,6 @@ IF NOT EXIST %TMP% (
 REM Compute half the amount of processors so some jobs can run
 SET /a HALF_PROCESSORS = NUMBER_OF_PROCESSORS / 2
 
-IF "%CMAKE_INCLUDE_WIX%"=="True" (
-    REM Explicitly enable wix via command line arg for forensic logging
-    SET CMAKE_OPTIONS=%CMAKE_OPTIONS% -DLY_WIX_PATH="%WIX%"
-) ELSE (
-    REM Disable implicit enabling of windows packing by clearing out the wix variable
-    SET WIX=
-)
-
 SET LAST_CONFIGURE_CMD_FILE=ci_last_configure_cmd.txt
 SET CONFIGURE_CMD=cmake %SOURCE_DIRECTORY% %CMAKE_OPTIONS% %EXTRA_CMAKE_OPTIONS% -DLY_3RDPARTY_PATH="%LY_3RDPARTY_PATH%" -DLY_PROJECTS=%CMAKE_LY_PROJECTS%
 IF NOT EXIST CMakeCache.txt (