fix: Reuse NcAutoCompleteResult, remove code duplication

[joshtrichards]

📝 Summary

• Resolves: #3142

🖼️ Screenshots

🏚️ Before	🏡 After
B	A

🚧 TODO

• [ ] ...

🏁 Checklist

• [ ] Code is properly formatted (npm run lint / npm run stylelint / composer run cs:check)
• [ ] Sign-off message is added to all commits
• [ ] Tests (unit, integration and/or end-to-end) passing and the changes are covered with tests
• [ ] Documentation (README or documentation) has been updated or is not required

[luka-nextcloud]

Looks good to me 👍

[mejo-]

Tested and works well. Thanks @joshtrichards :heart:

[mejo-]

/backport to stable30