Issue #3590939: Modernize block_visibility_groups for Drupal 10/11

Chris Dartrequested to merge
issue/block_visibility_groups-3590939:3590939-php-8.4-fixes into 2.0.x

Issue #3590939: Modernize block_visibility_groups for Drupal 10/11 with typing, attributes, and code cleanup

  • Add return types and typed properties across the codebase for PHP 8+ compatibility
  • Convert annotations to PHP attributes (ConfigEntityType, Condition)
  • Refactor BlockVisibilityGroup entity with strict typing and improved method signatures
  • Update service usage and dependency injection patterns (notably ConditionGroup)
  • Normalize naming conventions (e.g., camelCase properties)
  • Improve safety with null coalescing and explicit return values
  • Update logging to use exception messages instead of objects
  • Clean up docblocks, comments, and formatting to meet coding standards
  • Remove dead code and outdated TODOs
  • Update tests to align with new property access patterns

⚠️ Introduces stricter typing and minor API changes that may affect downstream code.

Closes #3590939

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