fix(email): Emails are not sent in multiple cases

- fix(email): transactional emails are all not sent if `Use system wide (transactional) email settings` is disabled and no other email provide is setup on the Notifications page
- fix(email): no emails are sent if SMTP username and SMTP password are empty (which is the case in dev for example)
- fix(email): Wrong test email notification is used, causing the transactional email test notification to fail if no email provider is set up on the Notifications page.

app/Livewire/SettingsEmail.php

@@ -4,7 +4,7 @@ namespace App\Livewire;
 
 use App\Models\InstanceSettings;
 use App\Models\Team;
-use App\Notifications\Test;
+use App\Notifications\TransactionalEmails\Test;
 use Illuminate\Support\Facades\RateLimiter;
 use Livewire\Attributes\Locked;
 use Livewire\Attributes\Validate;