[fix] Avoid retaining DOM nodes in Touchable

Explicitly clear the DOM nodes to prevent memory leaks.

Fix #2039
Close #2047

Author: bhanu-allaparthi

packages/react-native-web/src/exports/Touchable/index.js

@@ -393,6 +393,10 @@ const TouchableMixin = {
     this.touchableDelayTimeout && clearTimeout(this.touchableDelayTimeout);
     this.longPressDelayTimeout && clearTimeout(this.longPressDelayTimeout);
     this.pressOutDelayTimeout && clearTimeout(this.pressOutDelayTimeout);
+    // Clear DOM nodes
+    this.pressInLocation = null;
+    this.state.touchable.responderID = null;
+    this._touchableNode = null;
   },
 
   /**