GP: Optimize plugin.xml to insert External Tables option
GP: Optimize plugin.xml to insert External Tables option

- Using `treeInsertion` instead of recreating the view tree from
scratch.


Former-commit-id: 2e9564bee73ff2dc37cb078abc747509c1a6bd89
serge-rider/dbeaver,dbeaver/dbeaver,Sargul/dbeaver,serge-rider/dbeaver,serge-rider/dbeaver,dbeaver/dbeaver,dbeaver/dbeaver,dbeaver/dbeaver,Sargul/dbeaver,serge-rider/dbeaver,Sargul/dbeaver,Sargul/dbeaver,Sargul/dbeaver