fix(core): custom 404 page not rendering (#957)

.changeset/rare-bees-beg.md

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+---
+"@bigcommerce/catalyst-core": patch
+---
+
+fix custom 404 page not being used

core/app/[locale]/(default)/[...rest]/page.tsx

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+import { notFound } from 'next/navigation';
+
+export default function CatchAllPage() {
+  notFound();
+}

core/tests/ui/desktop/e2e/404.spec.ts

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+import { expect, test } from '@playwright/test';
+
+test('404 page', async ({ page }) => {
+  await page.goto('/unknown-url');
+
+  await expect(page.getByRole('heading', { name: "We couldn't find that page!" })).toBeVisible();
+});