QmlProject: Search in content for .ui.qml files first

Change-Id: I1cf8a0bc83c24a0207e68a12a9a441cc7432a013
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>
Reviewed-by: <github-actions-qt-creator@cristianadam.eu>
Reviewed-by: Thomas Hartmann <thomas.hartmann@qt.io>

src/plugins/qmlprojectmanager/qmlproject.h

@@ -151,6 +151,8 @@ protected:
 
 private:
     ProjectExplorer::DeploymentKnowledge deploymentKnowledge() const override;
+    Utils::FilePaths getUiQmlFilesForFolder(const Utils::FilePath &folder);
+
     QMetaObject::Connection m_openFileConnection;
 };