onClaim
fun onClaim(command: CommandMessage<ClaimView>, sharedBoardReferences: SharedBoardReferences): Mono<ViewAudienceChanged>
Moves a shared view to the owner named by ClaimView.toOwnerId, the caller's own path. It is dispatched to the view's current owner, so Wow's owner check passes only for a view that is shared (or, in process, for a personal view claimed by the owner it already has, which records the change to the same owner). A view some shared dashboard references stays shared.