[DI]: removed unnecessary checks on Definitions and Aliases

If it is "public", then for sure it is not "private".

symfony/symfony#61505 (comment)

Author: MacDada

Tests/DependencyInjection/FormPassTest.php

@@ -61,7 +61,7 @@ public function testAddTaggedTypes()
         $extDefinition = $container->getDefinition('form.extension');
 
         $locator = $extDefinition->getArgument(0);
-        $this->assertTrue(!$locator->isPublic() || $locator->isPrivate());
+        $this->assertTrue($locator->isPrivate());
         $this->assertEquals(
             (new Definition(ServiceLocator::class, [[
                 __CLASS__.'_Type1' => new ServiceClosureArgument(new Reference('my.type1')),