feat: track instance copies that use links

confirm deleations when other instances link to it

Signed-off-by: Rachel Powers <508861+Ryex@users.noreply.github.com>

launcher/InstanceCopyTask.cpp

@@ -137,6 +137,8 @@ void InstanceCopyTask::copyFinished()
     if(!m_keepPlaytime) {
         inst->resetTimePlayed();
     }
+    if (m_useLinks)
+        inst->addLinkedInstanceId(m_origInstance->id());
     emitSucceeded();
 }