Alerts: set zindex above the panel inspector (#24354)

* set alert zindex

* use tooltip zindex

packages/grafana-ui/src/components/Alert/_Alert.scss

@@ -39,6 +39,10 @@
   background: $alert-warning-bg;
 }
 
+.alert-container {
+  z-index: $zindex-tooltip;
+}
+
 .page-alert-list {
   z-index: 8000;
   min-width: 400px;

public/app/features/dashboard/components/Inspector/InspectJSONTab.tsx

@@ -104,7 +104,6 @@ export class InspectJSONTab extends PureComponent<Props, State> {
 
   onClipboardCopied = () => {
     appEvents.emit(AppEvents.alertSuccess, ['Content copied to clipboard']);
-    alert('TODO... the notice is behind the inspector!');
   };
 
   onApplyPanelModel = () => {