Reduce PHPStan baseline: use class-string instead

[VentyCZ]

Follow-up to #3758, continuing the effort to shrink phpstan-baseline.php by fixing the underlying type issues instead of suppressing them. (using class-string syntax instead of forcing with @var)

[Copilot]

🟡 Changes recommended

A couple of the new PHPDoc types over-promise (or rely on less-portable syntax) and should be adjusted to keep the type contracts accurate and reliably interpreted by tooling.

Once you've addressed the issues Copilot identified, you can request another Copilot review.

Pull request overview

This PR continues the effort to reduce phpstan-baseline.php by addressing underlying type issues, primarily by replacing inline @var casts with more precise class-string<...> typing in field-related code.

Changes:

• Refines field class resolution typing in FieldRepository::getFieldClassname() so downstream instantiation can be understood by PHPStan.
• Improves PHPDoc typing for discriminator-map computation in FieldDiscriminatorListener, including typed map properties and class-string annotations.
• Removes PHPStan baseline suppressions that are no longer needed for FieldDiscriminatorListener.

File summaries

File	Description
src/Repository/FieldRepository.php	Removes an inline cast in the factory path and adds class-string-based typing for field classname discovery.
src/Event/Listener/FieldDiscriminatorListener.php	Adds class-string-based typing for discriminator-map computation and removes the inline cast on instantiation.
phpstan-baseline.php	Drops ignore entries that should be resolved by the stronger typing changes.

Review details

• Files reviewed: 3/3 changed files
• Comments generated: 3
• Review effort level: Lite

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