fix(cloud-image-editor): little memory leak where cloud image editor was holding some references that prevents from context destroying

Author: nd0ut

abstract/Block.js

@@ -209,6 +209,8 @@ export class Block extends BaseComponent {
 
   /** @protected */
   destroyCallback() {
+    super.destroyCallback();
+
     let blocksRegistry = this.blocksRegistry;
     blocksRegistry?.delete(this);
 

blocks/CloudImageEditor/src/elements/slider/SliderUi.js

@@ -163,6 +163,7 @@ export class SliderUi extends Block {
   }
 
   destroyCallback() {
+    super.destroyCallback();
     this._observer?.disconnect();
   }
 }