chore: move tests to the correct place (#8773)

Author: gtm-nayan

packages/svelte/test/runtime/samples/attribute-escape/_config.js renamed to packages/svelte/test/runtime/samples/textarea-bind-value-escape/_config.js

@@ -0,0 +1,5 @@
+export default {
+	html: '<textarea></textarea>',
+	ssrHtml:
+		"<textarea>test'\"&gt;&lt;/textarea&gt;&lt;script&gt;alert('BIM');&lt;/script&gt;</textarea>"
+};