fix: Owners selection in dataset edit UX (#17063)

* boilerplate

* update owner select component

* this is working

* update onchange

* refactorig

* you need to useMemo or things break

* update test

* prettier

* move logic into bootstrap data endpoint

* address concerns

* oops

* oops

* fix test

superset-frontend/src/explore/components/controls/DatasourceControl/DatasourceControl.test.tsx

@@ -41,6 +41,7 @@ const createProps = () => ({
     name: 'channels',
     type: 'table',
     columns: [],
+    owners: [{ first_name: 'john', last_name: 'doe', id: 1, username: 'jd' }],
   },
   validationErrors: [],
   name: 'datasource',