Simplify subclasses list, remove from Box #12820

Job	Run time
Windows 2025/Visual C++ 2022 (test-bundled-gems)	54m 13s
Windows 2025/Visual C++ 2022 (check)	54m 54s
Windows 2022/Visual C++ 2022 (check)	45m 55s
Windows 11-arm/Visual C++ (btest test-basic test-tool)	1h 0m 38s
Windows result	4s
	3h 35m 44s

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