AbstractProcessStep: Use task tree for all subclasses

Introduce AbstractProcessStep::runRecipe() virtual method
with the default implementation.

Task-number: QTCREATORBUG-29168
Change-Id: Iac75f4c38f8ee91ad8ac9324bb27881a3722911f
Reviewed-by: <github-actions-qt-creator@cristianadam.eu>
Reviewed-by: hjk <hjk@qt.io>

src/plugins/cmakeprojectmanager/cmakebuildstep.cpp

@@ -347,7 +347,7 @@ void CMakeBuildStep::setupOutputFormatter(Utils::OutputFormatter *formatter)
     CMakeAbstractProcessStep::setupOutputFormatter(formatter);
 }
 
-void CMakeBuildStep::doRun()
+Tasking::GroupItem CMakeBuildStep::runRecipe()
 {
     using namespace Tasking;
 
@@ -380,8 +380,7 @@ void CMakeBuildStep::doRun()
         onGroupDone(onEnd),
         onGroupError(onEnd)
     };
-
-    runTaskTree(root);
+    return root;
 }
 
 QString CMakeBuildStep::defaultBuildTarget() const

src/plugins/cmakeprojectmanager/cmakebuildstep.h

@@ -81,7 +81,7 @@ private:
 
     bool init() override;
     void setupOutputFormatter(Utils::OutputFormatter *formatter) override;
-    void doRun() override;
+    Tasking::GroupItem runRecipe() final;
     QWidget *createConfigWidget() override;
 
     Utils::FilePath cmakeExecutable() const;