[backport cloud/1.37] feat: When a list of strings is received, show all of them. (#8196)

Backport of #8195 to `cloud/1.37`

Automatically created by backport workflow.

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-8196-backport-cloud-1-37-feat-When-a-list-of-strings-is-received-show-all-of-them-2ef6d73d36508194a355d34222758435)
by [Unito](https://www.unito.io)

Co-authored-by: Alexander Brown <drjkl@comfy.org>

src/extensions/core/previewAny.ts

@@ -75,7 +75,9 @@ useExtensionService().registerExtension({
 
         for (const previewWidget of previewWidgets) {
           const text = message.text ?? ''
-          previewWidget.value = Array.isArray(text) ? (text[0] ?? '') : text
+          previewWidget.value = Array.isArray(text)
+            ? (text?.join('\n\n') ?? '')
+            : text
         }
       }
     }