[CMake] How can I make CTest not do dart-related stuff?

[Robert Dailey]

I run ctest on my build server *just* to run the test executables and
get result XML. I use a separate tool to parse the XML and upload it
to an unrelated server (not CDash)

I get errors like below:

Cannot find file: /sourcerepo/build/DartConfiguration.tcl

Can someone explain what CTest is doing and if there is a way to turn it off?