Fixes #3147 - Remove the sliding sync proxy wait list

ElementX/Sources/Services/Authentication/AuthenticationService.swift

@@ -114,10 +114,6 @@ class AuthenticationService: AuthenticationServiceProtocol {
             // FIXME: How about we make a proper type in the FFI? 😅
             guard let error = error as? ClientError else { return .failure(.failedLoggingIn) }
             
-            if error.isElementWaitlist {
-                return .failure(.isOnWaitlist)
-            }
-            
             switch error.code {
             case .forbidden:
                 return .failure(.invalidCredentials)

ElementX/Sources/Services/Authentication/AuthenticationServiceProtocol.swift

@@ -26,7 +26,6 @@ enum AuthenticationServiceError: Error {
     case slidingSyncNotAvailable
     case accountDeactivated
     case failedLoggingIn
-    case isOnWaitlist
     case sessionTokenRefreshNotSupported
 }
 

ElementX/Sources/Services/Client/ClientError.swift

@@ -25,12 +25,4 @@ extension ClientError {
 
         return first
     }
-    
-    /// Whether or not the error is related to the sliding sync proxy being full.
-    ///
-    /// This is a temporary error whilst we scale the backend infrastructure.
-    var isElementWaitlist: Bool {
-        guard case let .Generic(message) = self else { return false }
-        return message.contains("IO_ELEMENT_X_WAIT_LIST")
-    }
 }