Forwarded messages from private room should strip related events

[dozro]

Describe the bug

Forwarded messages from private rooms should strip relations and mentions for privacy sake

Reproduction

No response

Expected behavior

No response

Platform and versions

- OS: Linux armv81
- Browser: Mozilla/5.0 (Linux; Android 10; K) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/145.0.0.0 Mobile Safari/537.36
- Sable: v1.6.0 (d9a8dae)

Additional context

No response