deprecated or unsupported model types should be flagged as invalid in Teiid Designer 7.X

The XML-Relational connectors were removed from Teiid and therefore the XML-Relational models are no longer valid artifacts. For model projects created in earlier versions of Designer with XML-Relational models, we should recognize those models (through their model extensions) and flag them as invalid. The message should provide the user with a pointer to the new way to integrate with xml/web services.