Remove element event listeners through base component (#33429)

After some research, I found out that EventHandler saves all the custom events per element using namespace, and is capable of removing handlers using only the element and its namespace (`DATA_KEY`).

So, probably is better to utilize the base-component to do the same job.

js/src/dropdown.js

@@ -237,7 +237,6 @@ class Dropdown extends BaseComponent {
   }
 
   dispose() {
-    EventHandler.off(this._element, EVENT_KEY)
     this._menu = null
 
     if (this._popper) {