[8.x] [Obs AI Assistant] Fix KB bulk import UI example (#214970) (#214987)

# Backport

This will backport the following commits from `main` to `8.x`:
- [[Obs AI Assistant] Fix KB bulk import UI example
(#214970)](https://github.com/elastic/kibana/pull/214970)

<!--- Backport version: 9.6.6 -->

### Questions ?
Please refer to the [Backport tool
documentation](https://github.com/sorenlouv/backport)

<!--BACKPORT [{"author":{"name":"Viduni
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AI Assistant] Fix KB bulk import UI example (#214970)\n\nCloses
https://github.com/elastic/kibana/issues/214849\n\n## Summary\n\nThe KB
bulk import UI example has a missing property `title`.\nThis PR adds the
missing property so that the users know which format is\nexpected when
bulk
importing.\n\n\n![image](https://github.com/user-attachments/assets/38466e7d-d87d-4680-8675-327237357999)\n\n###
Checklist\n\n- [x] The PR description includes the appropriate Release
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bulk import UI example has a missing property `title`.\nThis PR adds the
missing property so that the users know which format is\nexpected when
bulk
importing.\n\n\n![image](https://github.com/user-attachments/assets/38466e7d-d87d-4680-8675-327237357999)\n\n###
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https://github.com/elastic/kibana/issues/214849\n\n## Summary\n\nThe KB
bulk import UI example has a missing property `title`.\nThis PR adds the
missing property so that the users know which format is\nexpected when
bulk
importing.\n\n\n![image](https://github.com/user-attachments/assets/38466e7d-d87d-4680-8675-327237357999)\n\n###
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BACKPORT-->

Co-authored-by: Viduni Wickramarachchi <viduni.wickramarachchi@elastic.co>

x-pack/solutions/observability/plugins/observability_ai_assistant_management/public/routes/components/knowledge_base_bulk_import_flyout.tsx

@@ -138,6 +138,7 @@ export function KnowledgeBaseBulkImportFlyout({ onClose }: { onClose: () => void
         <EuiCodeBlock isCopyable paddingSize="s">
           {`{
   "id": "a_unique_human_readable_id",
+  "title": "Title of item",
   "text": "Contents of item",
 }
 `}