[Symfony73] Remove empty configure() method in CommandHelpToAttributeRector

[TomasVotruba]

Once setHelp() is moved to the #[AsCommand] attribute, the configure() method is often left empty. The removal code was a no-op — it unset() a local variable instead of removing the method from the class.

Now the empty configure() is removed, the same way #966 does it for CommandConfigureToAttributeRector. A leftover parent::configure() call counts as empty too.

 #[AsCommand(name: 'some_name', help: <<<'TXT'
 Some help text
 TXT)]
 final class AddHelpToAttributeCommand extends Command
 {
-    public function configure()
-    {
-    }
 }

With a parent::configure() left over:

-#[AsCommand(name: 'some_name')]
+#[AsCommand(name: 'some_name', help: <<<'TXT'
+Some help text
+TXT)]
 final class RemoveConfigureWithParentCall extends Command
 {
-    public function configure()
-    {
-        parent::configure();
-
-        $this->setHelp('Some help text');
-    }
 }

A configure() with other calls left in it is kept as is.