Rector: [PHP 8.0] Add Symfony/Validator to attributes

[TomasVotruba]

See https://github.com/symfony/symfony/pull/38309

[derrabus]

While the validator itself understands attributes now, I'm still working on migrating the individual constraints.

[TomasVotruba]

If migration path has the same logic as @Route → #[Route], then all we need to do here is to add validator annotatoin classes.

[TomasVotruba]

Link to all constraint classes: https://github.com/symfony/symfony/tree/master/src/Symfony/Component/Validator/Constraints

[derrabus]

There are a few more:

• https://github.com/symfony/symfony/tree/master/src/Symfony/Bridge/Doctrine/Validator/Constraints
• https://github.com/symfony/symfony/tree/master/src/Symfony/Component/Security/Core/Validator/Constraints

[derrabus]

Most constraints have been migrated now.

• Composite constraints (like All and AtLeastOneOf) must remain Doctrine-style annotations because we cannot nest PHP attributes unfortunately.
• The UniqueEntity constraint hasn't been migrated because we need to wait for a compatible Doctrine ORM version.

[TomasVotruba]

Thank you for updates. Could you also link PRs with those changes? Just so its easier to implement it.

My priorities have shifted now, but I'll give a try in the future.

[derrabus]

Sure:

• symfony/symfony#38382
• symfony/symfony#38410
• symfony/symfony#38499