[9.x] Use preferredLocale when notification is queued

[welderlourenco-candc]

Description

Laravel's documentation states

[...] Laravel allows you to send mailables in a locale other than the request's current locale, and will even remember this locale if the mail is queued.

[...] Once you have implemented the interface, Laravel will automatically use the preferred locale when sending mailables and notifications to the model.

however, this is only functioning for synced notifications, this PR fixes this by adding the functionality of sending a notification in the user's preferred locale when a notification is queued.

Example

// config/app.php
    'locale' => 'en',
    'fallback_locale' => 'en',

// en/notifications/example.php
return [
    'message' => 'English message'
];

// pt-br/notifications/example.php
return [
    'message' => 'Mensagem em português'
];

class User extends Authenticatable implements HasLocalePreference
{
     // ...

     public function preferredLocale(): string
     {
         return 'pt-br';
     }

     // ...
}

class ExampleNotification extends BaseNotification implements ShouldQueue
{
    use Queueable;
 
    /**
     * Method called by base notification, running inside worker, that fetches/formats a message.
     */
    protected function getMessage()
    {
        return __('notifications/example/message');
    }
}

$user->notify(new ExampleNotification());

// expected message: 'Mensagem em português'
// rendered message: 'English message'

[derekmd]

however, this is only functioning for synced notifications

Queued notifications do support the HasLocalePreference contract: #25752

Where is the ExampleNotification::getMessage() method being called? The details of the example's BaseNotification class need to be known to give enough context about what this is attempting to fix.

Related previous reports: #30429 #38486

[welderlourenco-candc]

Thanks for replying, you're absolutely right. It's gotta be some heavy caching with out current queue setup, tested on a fresh laravel install and it works fine. Please disregard.