Allow to make meeting conversation persistent right away

[nickvergessen]

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Steps to reproduce

1. Create a meeting conversation
2. Have discussion up front

Expected behaviour

You can already make sure it will not vanish

Actual behaviour

You have to wait until after the meeting.

Talk app

Talk app version: main

[Antreesy]

/api/{apiVersion}/room/{token}/object should work, just need to:

• add NcActionButton in TopBarMenu ✅
• introduce a new string in frontend ❄️