Add logging of exception and stacktrace if the Eformidling startup service fails (#78)

Co-authored-by: Ronny Birkeli <ronny.birkeli@digdir.no>

Author: RonnyB71

src/Altinn.App.Core/EFormidling/EformidlingStartup.cs

@@ -36,9 +36,9 @@ public async Task StartAsync(CancellationToken cancellationToken)
                 _logger.LogInformation("Successfully subscribed to event {eventType} for app {appIdentifier}. Subscription {subscriptionId} is being used.", eventType, _appIdentifier, subscription.Id);
             }
 
-            catch
+            catch (Exception ex)
             {
-                _logger.LogError("Unable to subscribe to event {eventType} for app {appIdentifier}", eventType, _appIdentifier);
+                _logger.LogError("Unable to subscribe to event {eventType} for app {appIdentifier}. Received exception {exceptionMessage} with {stackTrace}", eventType, _appIdentifier, ex.Message, ex.StackTrace);
                 throw;
             }
         }