Simplify subclasses list, remove from Box #12796

Job	Run time
Windows 2025/Visual C++ 2022 (check)	55m 43s
Windows 2025/Visual C++ 2022 (test-bundled-gems)	52m 36s
Windows 2022/Visual C++ 2022 (check)	52m 17s
Windows 11-arm/Visual C++ (btest test-basic test-tool)	50m 8s
Windows result	3s
	3h 30m 47s

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