[feature][dashboard] Show/hide filter indicator on the applicable charts when filter options are open/close (#8166)

* show ellipsis for long filter name in tooltip

* show filter indicator color bar when filter is applied

* show/hide filter indicator when filter is showing/hiding options

* use component local state to hide/show chart outline

* fix review comments + unit tests

superset/assets/spec/javascripts/dashboard/fixtures/mockDashboardState.js

@@ -29,4 +29,5 @@ export default {
   isStarred: true,
   isPublished: true,
   css: '',
+  focusedFilterField: [],
 };