add test

packages/svelte/tests/runtime-runes/samples/async-error-in-script/_config.js

@@ -0,0 +1,6 @@
+import { test } from '../../test';
+
+export default test({
+	mode: ['async-server', 'hydrate'],
+	error: 'oops'
+});

packages/svelte/tests/runtime-runes/samples/async-error-in-script/main.svelte

@@ -0,0 +1,7 @@
+<script>
+	await 1;
+
+	throw new Error('oops');
+</script>
+
+<h1>hello</h1>