minor #1779 Remove phpunit-bridge symlink (GromNaN)

This PR was merged into the 1.x branch.

Discussion
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Remove phpunit-bridge symlink

Tests in temporary projects are run in a distinct php process.

The context in which the tests are performed is different to what is stated in this comment: #480 (comment)

Also, that remove the requirement of `symfony/phpunit-bridge` for projects using the MakerTestCase.

Commits
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ab139a6 Remove phpunit-bridge symlink

Author: GromNaN

src/Test/MakerTestEnvironment.php

@@ -269,12 +269,6 @@ private function buildFlexSkeleton(): void
         MakerTestProcess::create('composer require phpunit:1.1.* browser-kit symfony/css-selector --prefer-dist --no-progress --no-suggest', $this->flexPath)
                         ->run();
 
-        if (!$this->isWindows) {
-            $this->fs->remove($this->flexPath.'/vendor/symfony/phpunit-bridge');
-
-            $this->fs->symlink($rootPath.'/vendor/symfony/phpunit-bridge', $this->flexPath.'/vendor/symfony/phpunit-bridge');
-        }
-
         $replacements = [
             // temporarily ignoring indirect deprecations - see #237
             [