Enable a few eslint-config-xo rules (#34620)

* unicorn/prefer-dom-node-append
* unicorn/prefer-dom-node-remove

js/src/tooltip.js

@@ -257,7 +257,7 @@ class Tooltip extends BaseComponent {
     Data.set(tip, this.constructor.DATA_KEY, this)
 
     if (!this._element.ownerDocument.documentElement.contains(this.tip)) {
-      container.appendChild(tip)
+      container.append(tip)
       EventHandler.trigger(this._element, this.constructor.Event.INSERTED)
     }
 
@@ -402,7 +402,7 @@ class Tooltip extends BaseComponent {
       if (this._config.html) {
         if (content.parentNode !== element) {
           element.innerHTML = ''
-          element.appendChild(content)
+          element.append(content)
         }
       } else {
         element.textContent = content.textContent