CP-17499 callback closure bind

[niden]

Hello!

• Type: bug fix
• Link to issue: [BUG]: Callback Closure::bind in 5.17.0 silently rebinds $this on existing class-method callbacks #17499

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• I have read and understood the Contributing Guidelines
• I have checked that another pull request for this purpose does not exist
• I wrote some tests for this PR
• I have updated the relevant CHANGELOG
• I have created a PR for the documentation about this change

Changed Phalcon\Filter\Validation\Validator\Callback to stop binding the callback closure to the validator; to set the message from inside the callback (#17255), declare a second parameter and call $validator->setTemplate() instead of $this->setTemplate()

Fixed Phalcon\Filter\Validation\Validator\Callback rebinding $this in callback closures; the validator is now passed as a second argument to closures that declare one

Thanks