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Fix https://github.com/matrix-org/synapse/issues/12678
Complement test added: https://github.com/matrix-org/complement/pull/369
**Before:** 500 internal server error
**After:** According to the [spec](https://spec.matrix.org/latest/client-server-api/#get_matrixclientv3roomsroomidmessages), calling `/messages` against a non-existent `room_id` should throw a 403 forbidden (since you're not part of the room). This also matches the behavior before https://github.com/matrix-org/synapse/pull/12370 which regressed Synapse to the 500 behavior.
```json
{
"errcode": "M_FORBIDDEN",
"error": "User @test:my.synapse.server not in room !dne:my.synapse.server, and room previews are disabled"
}
```
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