Log diagnostic summary on shutdown

Author: bhazen

identity-server/src/IdentityServer/Licensing/V2/Diagnostics/DiagnosticHostedService.cs

@@ -25,4 +25,11 @@ protected override async Task ExecuteAsync(CancellationToken stoppingToken)
             }
         }
     }
+
+    public override async Task StopAsync(CancellationToken cancellationToken)
+    {
+        await diagnosticSummary.PrintSummary();
+
+        await base.StopAsync(cancellationToken);
+    }
 }