…elper (HypeMC)

This PR was merged into the 6.2 branch.

Discussion
----------

[SecurityBundle] Add service alias for legacy Security helper

| Q             | A
| ------------- | ---
| Branch?       | 6.2
| Bug fix?      | yes
| New feature?  | no
| Deprecations? | yes
| Tickets       | -
| License       | MIT
| Doc PR        | -

The service alias for `Symfony\Component\Security\Core\Security` was removed in #46094 which causes existing code to break when upgrading to 6.2, eg:

```php
use Symfony\Component\Security\Core\Security;

class HomeController extends AbstractController
{
    public function __construct(private Security $security)
    {
    }
}
```
results in:
![image](https://user-images.githubusercontent.com/2445045/172196153-dbcacf0e-0632-40ad-87a2-bbe7774cc698.png)

Commits
-------

0b81a75 [SecurityBundle] Add service alias for legacy Security helper