fix: Explore popovers issues (#11428)

* Fix spaces and comas not working in filter popover

* Fix popup not opening automatically

* Add e2e test

* Remove only from test

* Remove redundant test, add checking label content

* Add comments to e2e test

* Fix unit test

* Use destructuring

* Always open popup for functions and saved metrics, too

* Fix popover for adhoc metrics too

* Small refactor to consistency

* Refactor for consistency

* Remove redundant functions

* Test fix

Co-authored-by: Jesse Yang <jesse.yang@airbnb.com>

superset-frontend/src/explore/components/controls/AdhocFilterControl.jsx

@@ -180,9 +180,10 @@ export default class AdhocFilterControl extends React.Component {
             operator: OPERATORS['>'],
             comparator: 0,
             clause: CLAUSES.HAVING,
+            isNew: true,
           });
         }
-        // has a custom label
+        // has a custom label, meaning it's custom column
         if (option.label) {
           return new AdhocFilter({
             expressionType:
@@ -196,6 +197,7 @@ export default class AdhocFilterControl extends React.Component {
             operator: OPERATORS['>'],
             comparator: 0,
             clause: CLAUSES.HAVING,
+            isNew: true,
           });
         }
         // add a new filter item
@@ -262,7 +264,7 @@ export default class AdhocFilterControl extends React.Component {
 
   render() {
     return (
-      <div className="metrics-select">
+      <div className="metrics-select" data-test="adhoc-filter-control">
         <ControlHeader {...this.props} />
         <OnPasteSelect
           isMulti