remove unnecessary test (#10008)

Co-authored-by: Rich Harris <rich.harris@vercel.com>

packages/svelte/tests/runtime-runes/samples/transition-js-initial/_config.js

@@ -1,14 +0,0 @@
-import { test } from '../../test';
-
-export default test({
-	test({ assert, component, target, raf }) {
-		component.visible = true;
-
-		const div = /** @type {HTMLDivElement & { foo: number }} */ (target.querySelector('div'));
-		raf.tick(0);
-		assert.equal(div.foo, 0);
-
-		raf.tick(50);
-		assert.equal(div.foo, 0.5);
-	}
-});

packages/svelte/tests/runtime-runes/samples/transition-js-initial/main.svelte

@@ -1,16 +0,0 @@
-<script>
-	const { visible = false } = $props();
-
-	function foo(node, params) {
-		return {
-			duration: 100,
-			tick: t => {
-				node.foo = t;
-			}
-		};
-	}
-</script>
-
-{#if visible}
-	<div transition:foo></div>
-{/if}