fix: Email class may not log an error when it fails to send

[kenjis]

Description
Fixes #6350

Before:
no log

After:

ERROR - 2022-08-08 23:13:22 --> Email: Unable to send email using PHP SMTP. Your server might not be configured to send mail using this method.
ERROR - 2022-08-08 23:13:22 --> 220 smtp.googlemail.com ESMTP s1-20020a17090a2f0100b001f04479017fsm9022783pjd.29 - gsmtp

hello: 250-smtp.googlemail.com at your service, [133.149.85.47]
250-SIZE 35882577
250-8BITMIME
250-STARTTLS
250-ENHANCEDSTATUSCODES
250-PIPELINING
250-CHUNKING
250 SMTPUTF8

starttls: 220 2.0.0 Ready to start TLS

hello: 250-smtp.googlemail.com at your service, [133.149.85.47]
250-SIZE 35882577
250-8BITMIME
250-AUTH LOGIN PLAIN XOAUTH2 PLAIN-CLIENTTOKEN OAUTHBEARER XOAUTH
250-ENHANCEDSTATUSCODES
250-PIPELINING
250-CHUNKING
250 SMTPUTF8

Failed to authenticate password. Error: 535-5.7.8 Username and Password not accepted. Learn more at
535 5.7.8  https://support.google.com/mail/?p=BadCredentials s1-20020a17090a2f0100b001f04479017fsm9022783pjd.29 - gsmtp

How to Test

<?php

namespace App\Controllers;

class Home extends BaseController
{
    public function index()
    {
        $email = \Config\Services::email();

        $config['protocol']   = 'smtp';
        $config['SMTPHost']   = 'smtp.googlemail.com';
        $config['SMTPUser']   = 'test@gmail.com';
        $config['SMTPPass']   = 'passwd';
        $config['SMTPPort']   = 587;
        $config['SMTPCrypto'] = 'tls';

        $email->initialize($config);

        $email->setFrom('your@example.com', 'Your Name');
        $email->setTo('someone@example.com');
        $email->setSubject('Email Test');
        $email->setMessage('Testing the email class.');

        $email->send();

        d($email->printDebugger('headers'));
    }
}

Checklist:

• Securely signed commits
• Component(s) with PHPDoc blocks, only if necessary or adds value
• Unit testing, with >80% coverage
• User guide updated
• Conforms to style guide

[MGatner]

Good change! I'm so ready to be rid of this class... what a mess it can be.