Related to #4311
Add option to configure SMTP settings without encryption.
* Update `app/Livewire/Notifications/Email.php` and `app/Livewire/SettingsEmail.php` to include "No Encryption" option in the `smtpEncryption` field and update validation rules.
* Modify `app/Notifications/Channels/EmailChannel.php` to handle the "No Encryption" option in the `bootConfigs` method.
* Add `set_transanctional_email_settings` function in `app/Livewire/Help.php` to support the "No Encryption" option.
* Update `config/mail.php` to handle the "No Encryption" option in the mail configuration.
