[ENG-8424](https://linear.app/comm/issue/ENG-8424/update-inputstatecontainer-to-support-multimedia-messages-being-sent).
Later in the stack, we need to return `SendMessagePayload` (which has ` +interface: CallSingleKeyserverEndpointResultInfoInterface`) as a result of DM Ops -Ops. which is encrypting and queueing messages on Tunnelbrokerroker, not keyserver call.
Alternatives:
1. Use `tunnelbroker` instead of `none` - I think this is even worse for readability, becausee the type is associated with Keyserver.
2. Remove `interface` from `SendMessagePayload` - this seems the best and I think it's safe, because I wasn't able to find any usage of `interface`.
I am not familiar with why we need this at all, so curious forabout the reviewers' perspective.
Depends on D13319