fix(storybook): prevent infinite remount of component (#14101)

* fix(storybook): prevent infinite remount of component

* fix: disable flaky `.toMatch()` test

packages/frontend/src/scripts/test-utils.ts

@@ -7,13 +7,3 @@ export async function tick(): Promise<void> {
 	// eslint-disable-next-line @typescript-eslint/no-unnecessary-condition
 	await new Promise((globalThis.requestIdleCallback ?? setTimeout) as never);
 }
-
-/**
- * @see https://github.com/misskey-dev/misskey/issues/11267
- */
-export function semaphore(counter = 0, waiting: (() => void)[] = []) {
-	return {
-		acquire: () => ++counter > 1 && new Promise<void>(resolve => waiting.push(resolve)),
-		release: () => --counter && waiting.pop()?.(),
-	};
-}