Revert "Adopt async uniffi in the RoomSummaryProvider and ensure diffs are still processed serially"

This reverts commit d710dafc94.

ElementX/Sources/Services/Room/RoomSummary/RoomSummaryProvider.swift

@@ -110,19 +110,6 @@ class RoomSummaryProvider: RoomSummaryProviderProtocol {
         MXLog.info("\(name): Finished applying \(diffs.count) diffs, new room list \(rooms.compactMap { $0.id ?? "Empty" })")
     }
         
-    // The room summary provider needs to process diffs serially
-    // Switching to an actor here doesn't help because of all the suspension points
-    // and actor re-entrance
-    private static var latestRoomMessage: EventTimelineItem?
-    private func fetchLastMessage(room: SlidingSyncRoomProtocol) {
-        let semaphore = DispatchSemaphore(value: 0)
-        Task {
-            Self.latestRoomMessage = await room.latestRoomMessage()
-            semaphore.signal()
-        }
-        semaphore.wait()
-    }
-        
     private func buildRoomSummaryForIdentifier(_ identifier: String, invalidated: Bool) -> RoomSummary {
         guard let room = try? slidingSyncListProxy.roomForIdentifier(identifier) else {
             MXLog.error("\(name): Failed finding room with id: \(identifier)")
@@ -132,13 +119,15 @@ class RoomSummaryProvider: RoomSummaryProviderProtocol {
         var attributedLastMessage: AttributedString?
         var lastMessageFormattedTimestamp: String?
         
-        fetchLastMessage(room: room)
+        // Dispatch onto another queue otherwise the rust method latestRoomMessage crashes.
-        
+        // This will be fixed when we get async uniffi support.
-        if let latestRoomMessage = Self.latestRoomMessage {
+        DispatchQueue.global(qos: .userInitiated).sync {
+            if let latestRoomMessage = room.latestRoomMessage() {
                 let lastMessage = EventTimelineItemProxy(item: latestRoomMessage)
                 lastMessageFormattedTimestamp = lastMessage.timestamp.formattedMinimal()
                 attributedLastMessage = eventStringBuilder.buildAttributedString(for: lastMessage)
             }
+        }
         
         let fullRoom = room.fullRoom()
         let avatarURL = fullRoom?.avatarUrl().flatMap(URL.init(string:))