fix(core): App should not crash with a custom rest endpoint (#5911)

fixes #5880

packages/editor-ui/src/shims.d.ts

@@ -11,12 +11,12 @@ declare global {
 			PROD: boolean;
 			NODE_ENV: 'development' | 'production';
 			VUE_APP_URL_BASE_API: string;
-			VUE_APP_ENDPOINT_REST?: string;
 		};
 	}
 
 	interface Window {
 		BASE_PATH: string;
+		REST_ENDPOINT: string;
 	}
 
 	namespace JSX {