fix: deprecated `UpgradeApiResourceCommand::$defaultName`

[chalasr]

Q	A
Branch?	2.7
Tickets	-
License	MIT
Doc PR	-

Fixes:

• 1x: Since symfony/console 6.1: Relying on the static property "$defaultName" for setting a command name is deprecated. Add the "Symfony\Component\Console\Attribute\AsCommand" attribute to the "ApiPlatform\Core\Bridge\Symfony\Bundle\Command\UpgradeApiResourceCommand" class instead.

[alanpoulain]

I think you should use the getDefaultName method, like this PR: https://github.com/api-platform/core/pull/4795

[chalasr]

As discussed this way is more future-proof and inline with what has been done in other community bundles. Opened #4889 to use it across the board