chore: remove unused code (#11190)

leftover from earlier iterations of #11183

packages/svelte/src/internal/client/index.js

@@ -137,7 +137,7 @@ export {
 	$window as window,
 	$document as document
 } from './dom/operations.js';
-export { noop, call_once } from '../shared/utils.js';
+export { noop } from '../shared/utils.js';
 export {
 	add_snippet_symbol,
 	validate_component,

packages/svelte/src/internal/shared/utils.js

@@ -23,19 +23,3 @@ export function run_all(arr) {
 		arr[i]();
 	}
 }
-
-/**
- * @param {Function} fn
- */
-export function call_once(fn) {
-	let called = false;
-	/** @type {unknown} */
-	let result;
-	return function () {
-		if (!called) {
-			called = true;
-			result = fn();
-		}
-		return result;
-	};
-}