refactor: typing for explore Control and messageToasts (#11416)

superset-frontend/src/datasource/DatasourceEditor.jsx

@@ -618,6 +618,7 @@ class DatasourceEditor extends React.PureComponent {
         <div className="m-l-10 m-t-20 m-b-10">
           {DATASOURCE_TYPES_ARR.map(type => (
             <Radio
+              key={type.key}
               value={type.key}
               inline
               onChange={this.onDatasourceTypeChange.bind(this, type.key)}