refactor: drop final from the test classes too

Same habit as in src, same absence of a reason: nobody extends a test
case. The classes the tests analyse keep theirs — there final is a
property of the specimen, not a design choice, and one may well need to
be final some day.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

Author: fain182

tests/Integration/AndThatFilterTest.php

@@ -14,7 +14,7 @@
 use org\bovigo\vfs\vfsStream;
 use PHPUnit\Framework\TestCase;
 
-final class AndThatFilterTest extends TestCase
+class AndThatFilterTest extends TestCase
 {
     public function test_only_classes_matching_both_namespace_and_naming_are_checked(): void
     {

tests/Integration/CheckClassHaveAttributeTest.php

@@ -12,7 +12,7 @@
 use org\bovigo\vfs\vfsStream;
 use PHPUnit\Framework\TestCase;
 
-final class CheckClassHaveAttributeTest extends TestCase
+class CheckClassHaveAttributeTest extends TestCase
 {
     public function test_models_should_reside_in_app_model(): void
     {

tests/Integration/CheckClassHaveTraitTest.php

@@ -12,7 +12,7 @@
 use org\bovigo\vfs\vfsStream;
 use PHPUnit\Framework\TestCase;
 
-final class CheckClassHaveTraitTest extends TestCase
+class CheckClassHaveTraitTest extends TestCase
 {
     public function test_feature_tests_should_use_database_transactions_trait(): void
     {

tests/Integration/CheckClassNotHaveAttributeTest.php

@@ -12,7 +12,7 @@
 use org\bovigo\vfs\vfsStream;
 use PHPUnit\Framework\TestCase;
 
-final class CheckClassNotHaveAttributeTest extends TestCase
+class CheckClassNotHaveAttributeTest extends TestCase
 {
     public function test_controllers_should_not_have_deprecated_attribute(): void
     {

tests/Unit/Expressions/ForClasses/IsATest.php

@@ -14,7 +14,7 @@
 use Arkitect\Tests\Unit\Expressions\ForClasses\IsATest\Fruit\FruitInterface;
 use PHPUnit\Framework\TestCase;
 
-final class IsATest extends TestCase
+class IsATest extends TestCase
 {
     public function test_it_should_have_no_violation_when_it_implements(): void
     {

tests/Unit/Expressions/ForClasses/IsNotATest.php

@@ -14,7 +14,7 @@
 use Arkitect\Tests\Unit\Expressions\ForClasses\IsNotA\Fruit\FruitInterface;
 use PHPUnit\Framework\TestCase;
 
-final class IsNotATest extends TestCase
+class IsNotATest extends TestCase
 {
     public function test_it_should_have_no_violation_when_it_doesnt_extend(): void
     {