Limit conversations a message can be forwarded to (#5793)

* Limit conversations a message can be forwarded to

* Review fixups

* fix: remove the unused constant argument

---------

Co-authored-by: Mauro Romito <mauro.romito@element.io>

ElementX/Sources/Screens/MessageForwardingScreen/View/MessageForwardingScreen.swift

@@ -19,6 +19,7 @@ struct MessageForwardingScreen: View {
                 ForEach(context.viewState.rooms) { room in
                     MessageForwardingListRow(room: room,
                                              isSelected: context.viewState.selectedRoomIDs.contains(room.id),
+                                             isDisabled: context.viewState.isAtRoomSelectionLimit && !context.viewState.selectedRoomIDs.contains(room.id),
                                              context: context)
                 }
                 // Replace these with ScrollView's `scrollPosition` when dropping iOS 16.
@@ -68,6 +69,7 @@ private struct MessageForwardingListRow: View {
     
     let room: MessageForwardingRoom
     let isSelected: Bool
+    let isDisabled: Bool
     let context: MessageForwardingScreenViewModel.Context
     
     var body: some View {
@@ -77,6 +79,7 @@ private struct MessageForwardingListRow: View {
                 kind: .selection(isSelected: isSelected) {
                     context.send(viewAction: .selectRoom(roomID: room.id))
                 })
+                .disabled(isDisabled)
     }
     
     @ViewBuilder