minor #28036 [TwigBridge][Form] fix tests by moving AbstractBootstrap* cases to the bridge (nicolas-grekas)

This PR was merged into the 3.4 branch.

Discussion
----------

[TwigBridge][Form] fix tests by moving AbstractBootstrap* cases to the bridge

| Q             | A
| ------------- | ---
| Branch?       | 3.4
| Bug fix?      | no
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | #27897
| License       | MIT
| Doc PR        | -

Commits
-------

8869b296b8 [TwigBridge][Form] fix tests by moving AbstractBootstrap* cases to the bridge

src/Symfony/Bridge/Twig/Tests/Extension/AbstractBootstrap3HorizontalLayoutTest.php

@@ -9,7 +9,7 @@
  * file that was distributed with this source code.
  */
 
-namespace Symfony\Component\Form\Tests;
+namespace Symfony\Bridge\Twig\Tests\Extension;
 
 abstract class AbstractBootstrap3HorizontalLayoutTest extends AbstractBootstrap3LayoutTest
 {

src/Symfony/Bridge/Twig/Tests/Extension/AbstractBootstrap3LayoutTest.php

@@ -9,9 +9,10 @@
  * file that was distributed with this source code.
  */
 
-namespace Symfony\Component\Form\Tests;
+namespace Symfony\Bridge\Twig\Tests\Extension;
 
 use Symfony\Component\Form\FormError;
+use Symfony\Component\Form\Tests\AbstractLayoutTest;
 
 abstract class AbstractBootstrap3LayoutTest extends AbstractLayoutTest
 {

src/Symfony/Bridge/Twig/Tests/Extension/AbstractBootstrap4HorizontalLayoutTest.php

@@ -9,7 +9,7 @@
  * file that was distributed with this source code.
  */
 
-namespace Symfony\Component\Form\Tests;
+namespace Symfony\Bridge\Twig\Tests\Extension;
 
 use Symfony\Component\Form\FormError;
 

src/Symfony/Bridge/Twig/Tests/Extension/AbstractBootstrap4LayoutTest.php

@@ -9,7 +9,7 @@
  * file that was distributed with this source code.
  */
 
-namespace Symfony\Component\Form\Tests;
+namespace Symfony\Bridge\Twig\Tests\Extension;
 
 use Symfony\Component\Form\Extension\Core\Type\ButtonType;
 use Symfony\Component\Form\Extension\Core\Type\CheckboxType;

src/Symfony/Bridge/Twig/Tests/Extension/FormExtensionBootstrap3HorizontalLayoutTest.php

@@ -18,7 +18,6 @@ use Symfony\Bridge\Twig\Tests\Extension\Fixtures\StubTranslator;
 use Symfony\Bridge\Twig\Tests\Extension\Fixtures\StubFilesystemLoader;
 use Symfony\Component\Form\FormRenderer;
 use Symfony\Component\Form\FormView;
-use Symfony\Component\Form\Tests\AbstractBootstrap3HorizontalLayoutTest;
 use Twig\Environment;
 
 class FormExtensionBootstrap3HorizontalLayoutTest extends AbstractBootstrap3HorizontalLayoutTest

src/Symfony/Bridge/Twig/Tests/Extension/FormExtensionBootstrap3LayoutTest.php

@@ -18,7 +18,6 @@ use Symfony\Bridge\Twig\Tests\Extension\Fixtures\StubTranslator;
 use Symfony\Bridge\Twig\Tests\Extension\Fixtures\StubFilesystemLoader;
 use Symfony\Component\Form\FormRenderer;
 use Symfony\Component\Form\FormView;
-use Symfony\Component\Form\Tests\AbstractBootstrap3LayoutTest;
 use Twig\Environment;
 
 class FormExtensionBootstrap3LayoutTest extends AbstractBootstrap3LayoutTest

src/Symfony/Bridge/Twig/Tests/Extension/FormExtensionBootstrap4HorizontalLayoutTest.php

@@ -18,7 +18,6 @@ use Symfony\Bridge\Twig\Tests\Extension\Fixtures\StubTranslator;
 use Symfony\Bridge\Twig\Tests\Extension\Fixtures\StubFilesystemLoader;
 use Symfony\Component\Form\FormRenderer;
 use Symfony\Component\Form\FormView;
-use Symfony\Component\Form\Tests\AbstractBootstrap4HorizontalLayoutTest;
 use Twig\Environment;
 
 /**

src/Symfony/Bridge/Twig/Tests/Extension/FormExtensionBootstrap4LayoutTest.php

@@ -18,7 +18,6 @@ use Symfony\Bridge\Twig\Tests\Extension\Fixtures\StubTranslator;
 use Symfony\Bridge\Twig\Tests\Extension\Fixtures\StubFilesystemLoader;
 use Symfony\Component\Form\FormRenderer;
 use Symfony\Component\Form\FormView;
-use Symfony\Component\Form\Tests\AbstractBootstrap4LayoutTest;
 use Twig\Environment;
 
 /**