gh-160665: Resolve dataclass fixture imports before defining A

Resolve the complete circular from-import before defining A so lazy_imports=all exercises unresolved annotations as in normal mode. Keep the strict ForwardRef and classification assertions unchanged.

Author: LarryHu0217

Lib/test/test_dataclasses/dataclass_lazy_initvar.py

@@ -5,6 +5,10 @@
     QualifiedInitVar,
 )
 
+# Resolve every circular import before A is defined, even with lazy_imports=all.
+_ = (AliasedInitVar, DeferredClassVar, DeferredField, DirectInitVar,
+     QualifiedInitVar)
+
 __all__ = [
     'A', 'AliasedInitVar', 'DeferredClassVar', 'DeferredField',
     'DirectInitVar', 'QualifiedInitVar',