GenericConstraints.cs

public class ValidatorBehavior<TRequest, TResponse> 
     : IPipelineBehavior<TRequest, TResponse> where TRequest : IValidatable
{
    private readonly IEnumerable<IValidator<T>> _validators;
    
    public ValidatorBehavior(IEnumerable<IValidator<T>> validators)
        => _validators = validators

    public Task<TResponse> Handle(TRequest request, CancellationToken cancellationToken, RequestHandlerDelegate<TResponse> next)
    {
         var results = _validators.Select(v => v.Validate(request)).ToList();
         if (results.Any(result => result.Invalid)) {
             throw new ValidationException(result);
         }
         
         return next();
    }
}