feat : display outdated client banner for linked devices

SessionMessagingKit/Sending & Receiving/Message Handling/MessageReceiver+ExpirationTimers.swift

@@ -2,6 +2,7 @@
 
 import Foundation
 import GRDB
+import SessionUIKit
 import SessionUtilitiesKit
 
 extension MessageReceiver {
@@ -161,6 +162,10 @@ extension MessageReceiver {
                 Contact.Columns.lastKnownClientVersion.set(to: lastKnownClientVersion)
             )
         
+        if sender == getUserHexEncodedPublicKey(db) && lastKnownClientVersion == .legacyDisappearingMessages {
+            TopBannerController.show(warning: .outdatedUserConfig)
+        }
+        
         guard
             Features.useNewDisappearingMessagesConfig,
             proto.hasLastDisappearingMessageChangeTimestamp