fix!: refactor warning icon (#7112)

* feat: add basic warning icon

* feat: work on actually using the warning icon

* chore: add docs

* chore: delete old warning icon

* chore: fix build

* chore: my own comments

* chore: move Warning to icons.WarningIcon

* chore: move properties to the module level

* chore: properly override and call super

* chore: properly use optional chaining

* chore: fixup comment typo

* chore: change imports to import type

* chore: reduces changes in block js files

* chore: add renaming

core/block.ts

@@ -2231,6 +2231,7 @@ export class Block implements IASTNodeLocation, IDeletable {
    */
   removeIcon(type: string): boolean {
     if (!this.hasIcon(type)) return false;
+    this.getIcon(type)?.dispose();
     this.icons = this.icons.filter((icon) => icon.getType() !== type);
     return true;
   }