CMakePM: Add support for qtc_runnable feature

This will allow for the Qt Creator's CMake build only qtcreator
target to be selected as runnable.

Similar to qmake's qtc_runnable or Qbs's qtcRunnable features.

Fixes: QTCREATORBUG-25908
Change-Id: I6416873d0ad9cfec4960d98fc4b289ec98cc58b1
Reviewed-by: Eike Ziller <eike.ziller@qt.io>

src/plugins/cmakeprojectmanager/cmakebuildsystem.cpp

@@ -1009,6 +1009,7 @@ const QList<BuildTargetInfo> CMakeBuildSystem::appTargets() const
             bti.workingDirectory = ct.workingDirectory;
             bti.buildKey = buildKey;
             bti.usesTerminal = !ct.linksToQtGui;
+            bti.isQtcRunnable = ct.qtcRunnable;
 
             // Workaround for QTCREATORBUG-19354:
             bti.runEnvModifier = [this, buildKey](Environment &env, bool enabled) {

src/plugins/cmakeprojectmanager/cmakebuildtarget.h

@@ -54,6 +54,7 @@ public:
     Utils::FilePath executable; // TODO: rename to output?
     TargetType targetType = UtilityType;
     bool linksToQtGui = false;
+    bool qtcRunnable = true;
     Utils::FilePath workingDirectory;
     Utils::FilePath sourceDirectory;
     Utils::FilePath makeCommand;

src/plugins/cmakeprojectmanager/fileapidataextractor.cpp

@@ -256,6 +256,8 @@ QList<CMakeBuildTarget> generateBuildTargets(const PreprocessedData &input,
                                                                  || f.fragment.contains("Qt6Gui"));
                                                   });
 
+                ct.qtcRunnable = t.folderTargetProperty == "qtc_runnable";
+
                 // Extract library directories for executables:
                 for (const FragmentInfo &f : t.link.value().fragments) {
                     if (f.role == "flags") // ignore all flags fragments