Canceling join request now actually changes the status to cancelled so trying to join same RequestToJoin whiteboard with code manually doesnt fail due to status being Pending

dotnet/AipsRT/Model/Users/UserService.cs

@@ -0,0 +1,23 @@
+using AipsCore.Application.Abstract;
+using AipsCore.Application.Models.User.Query.GetUser;
+using AipsCore.Application.Models.Whiteboard.Command.UserCanceledRequestToJoin;
+
+namespace AipsRT.Model.Users;
+
+public class UserService
+{
+    private readonly IDispatcher _dispatcher;
+    
+    public UserService(IDispatcher dispatcher)
+    {
+        _dispatcher = dispatcher;
+    }
+
+    public async Task<User> GetUser(Guid userId)
+    {
+        var query = new GetUserQuery(userId.ToString());
+        var userQueryDto = await _dispatcher.Execute(query);
+        
+        return new User(Guid.Parse(userQueryDto.Id), userQueryDto.UserName, userQueryDto.Email);
+    }
+}