PHP 8.4 Compatibility - Fix Deprecated Functionality

[vpashovski]

Fix: Deprecated Functionality: Implicitly marking parameter as nullable is deprecated, the explicit nullable type must be used;

Summary by CodeRabbit

• Refactor
  • Updated internal type declarations for improved code consistency and type safety across the codebase.

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Walkthrough

This pull request updates constructor and method signatures across multiple classes to use explicit nullable type declarations. The changes involve converting implicit nullable parameters (using = null defaults) to explicit nullable types using the ? syntax in PHP. Affected files include adminhtml blocks, console commands, configuration backend models, product models, and view models. Type declarations are updated for parameters such as Quote, $name, resource dependencies, serializers, and store IDs. The functional behavior remains unchanged, as default null values are preserved.

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