[Symfony 6] Add type hints to the methods overriding Symfony\Component\Validator\Mapping\Factory\MetadataFactoryInterface::getMetadataFor() and ::hasMetadataFor()

Problem/Motivation

Method "Symfony\Component\Validator\Mapping\Factory\MetadataFactoryInterface::getMetadataFor()" will return "MetadataInterface" as of its next major version. Doing the same in implementation "Drupal\Core\TypedData\Validation\RecursiveValidator" will be required when upgrading.

Method "Symfony\Component\Validator\Mapping\Factory\MetadataFactoryInterface::hasMetadataFor()" will return "bool" as of its next major version. Doing the same in implementation "Drupal\Core\TypedData\Validation\RecursiveValidator" will be required when upgrading.

Steps to reproduce

Proposed resolution

Add the return type hints.

Remaining tasks

User interface changes

API changes

Data model changes

Release notes snippet