Utilities/Release/WiX: Convert PATH modification preference to checkbox

Add explicit support for passing a ADD_CMAKE_TO_PATH={0,1} property to msiexec command-line installations to control the checkbox. Also preserve compatibility with the old ADD_CMAKE_TO_PATH={None,System} property, which previously controlled the radio button group, by mapping the values to the checkbox.

Remove the "Add CMake to the system PATH for the current user" option. It actually added CMake to the installing user's PATH, not the system PATH, even though CMake is installed to a system location.

Also revise the wording of the desktop shortcut checkbox to match the style of the PATH checkbox wording.

Issue: #21465 (closed)