feat: Adds the MetadataBar to the Explore header (#21560)

superset-frontend/src/explore/components/ExploreViewContainer/ExploreViewContainer.test.tsx

@@ -44,6 +44,14 @@ const reduxState = {
     slice: {
       slice_id: 1,
     },
+    metadata: {
+      created_on_humanized: 'a week ago',
+      changed_on_humanized: '2 days ago',
+      owners: ['John Doe'],
+      created_by: 'John Doe',
+      changed_by: 'John Doe',
+      dashboards: [{ id: 1, dashboard_title: 'Test' }],
+    },
   },
   charts: {
     1: {