refactor: Use composition for update time

The timer is not required by all classes and the deep inheritance makes
it hard to see where it is actually used. Use composition instead.

src/core/context/contextsimulatorimpl.cpp

@@ -90,7 +90,8 @@ namespace swift::core::context
                 Qt::QueuedConnection);
 
         m_validator->start(QThread::LowestPriority);
-        m_validator->startUpdating(60);
+        using namespace std::chrono_literals;
+        m_validator->startUpdating(60s);
     }
 
     // For validation we need simulator directory and model directory