feat(integration): add requires_tenant_configuration field and update related logic and tests

tests/Feature/Integration/MailServiceTest.php

@@ -57,6 +57,28 @@ class MailServiceTest extends TestCase
         $this->assertSame('tenant-smtp', $service->mailerName());
     }
 
+    public function test_it_uses_the_default_mailer_when_tenant_configuration_is_not_required(): void
+    {
+        Mail::fake();
+        config(['mail.default' => 'array']);
+        $tenant = $this->createTenant();
+        Integration::create([
+            'integration_code' => 'email',
+            'name' => 'Email',
+            'requires_tenant_configuration' => false,
+        ]);
+
+        $service = (new MailService)->forTenant($tenant->codigo);
+        $service->send('customer@example.com', 'Default mailer', '<p>Fallback</p>');
+
+        $this->assertSame('array', $service->mailerName());
+        Mail::assertSent(Mailable::class, function (Mailable $mail): bool {
+            return $mail->hasTo('customer@example.com')
+                && $mail->subject === 'Default mailer'
+                && str_contains($mail->render(), 'Fallback');
+        });
+    }
+
     public function test_on_setup_sends_a_branded_test_email_to_the_configured_sender(): void
     {
         Mail::fake();