Laravel components v8 (#2576)

- update actions ci
- include json for 4 spaces tab
- provide output int for process code exit
- adhere to parent type hint of builder
- mailer instance now needs a name, multiple can be instantiated
- getOriginal now uses mutators in the model
- Temporarily loosen MailableInterface requirements. This avoids an immediate BC break for classes in extensions that implement this interface.
- Temporarily provide (and autoload) old symfony translator interface
- make queue exception handler compatible with the contract of L8
- Update phpunit schema for newer version
- Update phpunit assert calls for newer version

src/User/AccountActivationMailer.php

@@ -14,7 +14,7 @@ use Flarum\Mail\Job\SendRawEmailJob;
 use Flarum\Settings\SettingsRepositoryInterface;
 use Flarum\User\Event\Registered;
 use Illuminate\Contracts\Queue\Queue;
-use Symfony\Component\Translation\TranslatorInterface;
+use Symfony\Contracts\Translation\TranslatorInterface;
 
 class AccountActivationMailer
 {

src/User/AvatarUploader.php

@@ -49,7 +49,7 @@ class AvatarUploader
      */
     protected function removeFileAfterSave(User $user)
     {
-        $avatarPath = $user->getOriginal('avatar_url');
+        $avatarPath = $user->getRawOriginal('avatar_url');
 
         $user->afterSave(function () use ($avatarPath) {
             if ($this->uploadDir->has($avatarPath)) {

src/User/Command/RequestPasswordResetHandler.php

@@ -18,7 +18,7 @@ use Illuminate\Contracts\Queue\Queue;
 use Illuminate\Contracts\Validation\Factory;
 use Illuminate\Database\Eloquent\ModelNotFoundException;
 use Illuminate\Validation\ValidationException;
-use Symfony\Component\Translation\TranslatorInterface;
+use Symfony\Contracts\Translation\TranslatorInterface;
 
 class RequestPasswordResetHandler
 {

src/User/EmailConfirmationMailer.php

@@ -14,7 +14,7 @@ use Flarum\Mail\Job\SendRawEmailJob;
 use Flarum\Settings\SettingsRepositoryInterface;
 use Flarum\User\Event\EmailChangeRequested;
 use Illuminate\Contracts\Queue\Queue;
-use Symfony\Component\Translation\TranslatorInterface;
+use Symfony\Contracts\Translation\TranslatorInterface;
 
 class EmailConfirmationMailer
 {