feature #58351 [Mailer] deprecate the TransportFactoryTestCase (xabbuh)

This PR was merged into the 7.2 branch.

Discussion
----------

[Mailer] deprecate the TransportFactoryTestCase

| Q             | A
| ------------- | ---
| Branch?       | 7.2
| Bug fix?      | no
| New feature?  | no
| Deprecations? | yes
| Issues        |
| License       | MIT

Commits
-------

e878066cac8 deprecate the TransportFactoryTestCase

Tests/Transport/SweegoTransportFactoryTest.php

@@ -16,12 +16,15 @@
 use Symfony\Component\Mailer\Bridge\Sweego\Transport\SweegoApiTransport;
 use Symfony\Component\Mailer\Bridge\Sweego\Transport\SweegoSmtpTransport;
 use Symfony\Component\Mailer\Bridge\Sweego\Transport\SweegoTransportFactory;
-use Symfony\Component\Mailer\Test\TransportFactoryTestCase;
+use Symfony\Component\Mailer\Test\AbstractTransportFactoryTestCase;
+use Symfony\Component\Mailer\Test\IncompleteDsnTestTrait;
 use Symfony\Component\Mailer\Transport\Dsn;
 use Symfony\Component\Mailer\Transport\TransportFactoryInterface;
 
-class SweegoTransportFactoryTest extends TransportFactoryTestCase
+class SweegoTransportFactoryTest extends AbstractTransportFactoryTestCase
 {
+    use IncompleteDsnTestTrait;
+
     public function getFactory(): TransportFactoryInterface
     {
         return new SweegoTransportFactory(null, new MockHttpClient(), new NullLogger());