feat(dashboard): Add description to the native filter (#17025)

* Adding description works

* Add some tests

* Fix tests

* Styled look good

* Tests successful

* Address PR comments

* fix a test

superset-frontend/spec/javascripts/dashboard/fixtures/mockNativeFilters.ts

@@ -68,6 +68,7 @@ export const nativeFiltersInfo: NativeFiltersState = {
         isRequired: false,
       },
       type: NativeFilterType.NATIVE_FILTER,
+      description: 'test description',
     },
   },
 };