CMakePM: Start integrating ctest

Gather some more information of a CMake based project to be
able to provide this later on to the AutoTest plugin.

Task-number: QTCREATORBUG-23332
Change-Id: I2beaf0a6456d57871dcf65832f0a79f37fe5fddc
Reviewed-by: David Schulz <david.schulz@qt.io>

src/plugins/cmakeprojectmanager/fileapidataextractor.cpp

@@ -689,6 +689,8 @@ FileApiQtcData extractData(FileApiData &input,
 
     setupLocationInfoForTargets(result.rootProjectNode.get(), result.buildTargets);
 
+    result.ctestPath = input.replyFile.ctestExecutable;
+
     return result;
 }