Support PHPStan 2.2.10 scope changes

[TomasVotruba]

PHPStan 2.2.10 emits node callbacks after a node's results are stored and replaces FiberScope with NodeCallbackScope. This flipped the parent/child callback ordering, so Rector's manual scope seeding on child expressions overwrote the correct, narrowed scope PHPStan had already attached. That broke type/scope resolution inside arrow functions, &&/|| operands, and nullsafe calls.

Changes

• PHPStanNodeScopeResolver
  • Unwrap the new NodeCallbackScope via toWalkScope().
  • Stop clobbering the arrow-function body scope, so fn($v) => $v['x'] infers from the outer array shape again.
  • Only seed a BinaryOp operand scope when PHPStan has not already set one, preserving is_array()/truthy narrowing on the right operand of && and ||.
• CallCollectionAnalyzer - strip null before resolving the object class of a nullsafe call caller; 2.2.10 no longer reports object class names for a nullable union, which made RemoveUnusedPrivateMethodRector drop methods called via ?->.
• NullToStrictStringIntConverter - drop the handling for the removed FiberScope.
• Bump required phpstan/phpstan to ^2.2.10.

Fixed failing fixtures

• SimplifyEmptyCheckOnEmptyArrayRector - replace_is_array_check
• RemoveUnusedPrivateMethodRector - keep_nullsafe_called_method
• RenameParamToMatchTypeRector - used_in_arrow_function_param
• AddArrowFunctionReturnTypeRector - return_by_array_shape_type

Full test suite, ECS, PHPStan level 8, and composer rector all pass locally.