Remove pointer events in favor of boundary viewport

app/assets/javascripts/pipelines/components/graph/action_component.vue

@@ -91,6 +91,7 @@ export default {
     class="js-ci-action btn btn-blank
 btn-transparent ci-action-icon-container ci-action-icon-wrapper"
     data-container="body"
+    data-boundary="viewport"
     @click="onClickAction"
   >
     <icon :name="actionIcon"/>

app/assets/stylesheets/bootstrap_migration.scss

@@ -128,11 +128,6 @@ table {
   border-spacing: 0;
 }
 
-.tooltip {
-  // Fix bootstrap4 bug whereby tooltips flicker when they are hovered over their borders
-  pointer-events: none;
-}
-
 .popover {
   font-size: 14px;
 }