[6.x] Replace announcements with control panel notifications

[riasvdv]

Description

Replaces the core announcements system with Laravel database notifications and adds a control panel notification center.

Example

Below is an example of a notification that could extend CpNotification to send to both the email channel and the control panel notifications:

<?php

declare(strict_types=1);

namespace App\Notifications;

use App\Models\Comment;
use CraftCms\Cms\Cp\Data\NotificationButtonData;
use CraftCms\Cms\Cp\Enums\ButtonVariant;
use CraftCms\Cms\Cp\Notifications\CpNotification;
use Illuminate\Bus\Queueable;
use Illuminate\Contracts\Queue\ShouldQueue;
use Illuminate\Notifications\Channels\MailChannel;
use Illuminate\Notifications\Messages\MailMessage;

class MentionNotification extends CpNotification
{
    public function __construct(
        public readonly Comment $comment,
    ) {
        $url = route('comments.show', $comment);

        parent::__construct(sprintf(
            '**%s** mentioned you in “%s”.',
            $comment->author->name,
            $comment->commentable->title,
        ));

        $this
            ->title('New mention')
            ->byline($comment->author->name)
            ->image(url: $comment->author->avatarUrl, alt: $comment->author->name)
            ->url($url)
            ->buttons([
                new NotificationButtonData(
                    label: 'View comment',
                    url: $url,
                    variant: ButtonVariant::Primary,
                ),
            ]);
    }

    /** @return class-string[] */
    public function via(object $notifiable): array
    {
        return [
            ...parent::via($notifiable),
            MailChannel::class,
        ];
    }

    public function toMail(object $notifiable): MailMessage
    {
        return new MailMessage()
            ->subject("{$this->comment->author->name} mentioned you")
            ->greeting("Hi {$notifiable->name},")
            ->line("{$this->comment->author->name} mentioned you in “{$this->comment->commentable->title}”.")
            ->action('View comment', route('comments.show', $this->comment));
    }
}

Sending the notification is then straightforward:

Notification::send(
    $comment->mentionedUsers,
    new MentionNotification($comment),
);

[linear-code]

CMS-2381

[github-actions]

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