Fix hub is busy response and error handling

Author: LucHeart

LiveControlGateway/Controllers/HubControllerBase.cs

@@ -141,13 +141,13 @@ protected override async Task<OneOf<Success, Error<OpenShockProblem>>> Connectio
         if (hubLifetimeResult.IsT1)
         {
             Logger.LogWarning("Hub lifetime busy, closing connection");
-            return new Error<OpenShockProblem>(ExceptionError.Exception);
+            return new Error<OpenShockProblem>(WebsocketError.WebsocketHubLifetimeBusy);
         }
 
         if (hubLifetimeResult.IsT2)
         {
             Logger.LogError("Hub lifetime error, closing connection");
-            return new Error<OpenShockProblem>();
+            return new Error<OpenShockProblem>(ExceptionError.Exception);
         }
 
         _hubLifetime = hubLifetimeResult.AsT0;

LiveControlGateway/LifetimeManager/HubLifetimeManager.cs

@@ -135,7 +135,8 @@ public async Task RemoveDeviceConnection(IHubController hubController)
         {
             if (!_lifetimes.TryGetValue(hubController.Id, out hubLifetime))
             {
-                _logger.LogError("Hub lifetime not found for hub [{HubId}]", hubController.Id);
+                // its fine, this is also the case when a precondition is not met for example.
+                _logger.LogDebug("Hub lifetime not found for hub [{HubId}]", hubController.Id); 
                 return;
             }