fix(NcListItem) - remove empty wrapper for additional elements from DOM if not needed

[Antreesy]

☑️ Resolves

• Fix #Open conversations: Text not vertically aligned nextcloud/spreed#10210
• Before component:
  • ...creates an empty <span> wrapper and fill it with children conditionally;
  • ...removes wrapper on hover (or if menu actions are forced) - look at bold text jumping;
• After component:
  • ...creates wrapper only if children should be there, otherwise skips;
  • ... hides wrapper with display: none on hover

🖼️ Screenshots (Talk)

🏚️ Before	🏡 After

🚧 Tasks

• Visual check
• Code review

🏁 Checklist

• ⛑️ Tests are included or are not applicable
• 📘 Component documentation has been extended, updated or is not applicable

[Antreesy]

/backport to stable7