delete unused tree base element

src/Umbraco.Web.UI.Client/src/backoffice/trees/shared/tree-base.element.ts

@@ -1,15 +0,0 @@
-import { LitElement } from 'lit';
-import { customElement, property } from 'lit/decorators.js';
-import type { ManifestTree } from '@umbraco-cms/models';
-
-@customElement('umb-tree-base')
-export class UmbTreeBase extends LitElement {
-	@property({ type: Object, attribute: false })
-	tree?: ManifestTree;
-}
-
-declare global {
-	interface HTMLElementTagNameMap {
-		'umb-tree-base': UmbTreeBase;
-	}
-}