[BUG]: Operands have incompatible types in Validation:validate() method

[Jeckerson]

Describe the bug
Incorrect return type is defined in Phalcon\Filter\Validation:validate() method.
It also can return false in line https://github.com/phalcon/cphalcon/blob/fc183e11e8b96c43daf7d893244846206dc2aa73/phalcon/Filter/Validation.zep#LL515C26-L515C26

To Reproduce
You need to define beforeValidation() method, which requires bool return type and is called in lines above.

<?php

use Phalcon\Filter\Validation;

class MyValidator extends Validation
{
    public function beforeValidation(array|object $data, $entity, Messages $messages): bool
    {
        return false;
    }

    public function initialize(): void
    {
        // Validation rules...
    }
}

Provide minimal script to reproduce the issue

$validator = new MyValidator();
if ($validator->validate() === false) {
    // This is valid.
}

Expected behavior

Return type of Phalcon\Filter\Validation\ValidationInterface:validate() must be Messages|false

Details

• Phalcon version: 5.2
• PHP Version: 8.1
• Operating System: any

[niden]

Resolved in #16338