[Console] Added the possibility to set a different default command

I am not quite sure if this is the best approach to solve the issue but the solution I provide works. Let me know your suggestions to improve it.

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | yes
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | #8058
| License       | MIT
| Doc PR       | symfony/symfony-docs#3426