fix(cdr-popover): fix popover focus bug. Fix open state bug in example

Add 50ms timeout for setting focus. Add event handler on the close event for the popover with custom
trigger

CDR-2377

src/components/popover/CdrPopover.jsx

@@ -82,7 +82,7 @@ export default {
       this.lastActive = activeElement;
       this.isOpen = true;
       this.$emit('opened', e);
-      this.$nextTick(() => {
+      setTimeout(() => {
         const tabbables = tabbable(this.$refs.popup.$el);
         if (tabbables[0]) tabbables[0].focus();
       });

src/components/popover/examples/Popover.vue

@@ -120,7 +120,7 @@
         content-class="popover-override"
         id="popover-custom-test"
         @opened="popupHandler"
-        @closed="popupHandler"
+        @closed="closedCustomHandler"
       >
         <cdr-text>
           This is an example of a popover where the trigger is not passed into the component
@@ -157,6 +157,10 @@ export default {
     popupHandler(e) {
       console.log(e);
     },
+    closedCustomHandler(e) {
+      this.open = false;
+      console.log(e);
+    },
   },
 };
 </script>