feat: Create dataset blank state (#21058)

* beginning of routing

* elizabeth review

* changed folder layout

* Dataset layout setup

* Fix DatasetLayout test

* Fixed height issue

* Fix link to sqllab

* Fix DatasetPanel test

* Remove arbitrary right panel

* Add empty state SVGs

* Restructure/rename some Dataset files

* Fixed styling issue

* Fix background color

* Fix header border

* Fix empty DatasetPanel styles

* Adjust description rendering in DatasetPanel to fix tests

* Add spaces back to blank dataset description to fix tests

* Fix blank dataset description styles

Co-authored-by: AAfghahi <arash.afghahi@gmail.com>

superset-frontend/src/explore/components/ExploreChartHeader/index.jsx

@@ -119,9 +119,7 @@ export const ExploreChartHeader = ({
   };
 
   useEffect(() => {
-    if (dashboardId) {
-      fetchChartDashboardData();
-    }
+    if (dashboardId) fetchChartDashboardData();
   }, []);
 
   const openPropertiesModal = () => {