test: remove redundant React Router warning suppression

Amp-Thread-ID: https://ampcode.com/threads/T-019c7d08-04f2-743c-9527-500a06f0ea9f
Co-authored-by: Amp <amp@ampcode.com>

Author: wheeljackz

test/setup.ts

@@ -1,27 +1 @@
 import '@testing-library/jest-dom/vitest'
-import { beforeAll, afterAll, vi } from 'vitest'
-
-const REACT_ROUTER_FUTURE_WARNING = 'React Router Future Flag Warning'
-const originalWarn = console.warn
-
-let warnSpy: ReturnType<typeof vi.spyOn>
-
-beforeAll(() => {
-  warnSpy = vi
-    .spyOn(console, 'warn')
-    .mockImplementation((...args: unknown[]) => {
-      const [firstArg] = args
-      if (
-        typeof firstArg === 'string' &&
-        firstArg.includes(REACT_ROUTER_FUTURE_WARNING)
-      ) {
-        return
-      }
-
-      originalWarn(...args)
-    })
-})
-
-afterAll(() => {
-  warnSpy?.mockRestore()
-})