TaskTree: Introduce TaskTreeRunner

This addresses the 30th point in the bugreport below.

Task-number: QTCREATORBUG-28741
Change-Id: Ifa157311b3aae413b19075d36e11c75e6066881d
Reviewed-by: <github-actions-qt-creator@cristianadam.eu>
Reviewed-by: hjk <hjk@qt.io>

src/libs/solutions/tasking/tasktreerunner.cpp

@@ -0,0 +1,33 @@
+// Copyright (C) 2024 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0
+
+#include "tasktreerunner.h"
+
+#include "tasktree.h"
+
+namespace Tasking {
+
+TaskTreeRunner::~TaskTreeRunner() = default;
+
+void TaskTreeRunner::start(const Group &recipe)
+{
+    m_taskTree.reset(new TaskTree(recipe));
+    connect(m_taskTree.get(), &TaskTree::done, this, [this](DoneWith result) {
+        m_taskTree.release()->deleteLater();
+        emit done(result);
+    });
+    m_taskTree->start();
+}
+
+void TaskTreeRunner::stop()
+{
+    if (m_taskTree)
+        m_taskTree->stop();
+}
+
+void TaskTreeRunner::reset()
+{
+    m_taskTree.reset();
+}
+
+} // namespace Tasking