Parallel Sweep [DRAFT] #12903

Job	Run time
Windows 11-arm/Visual C++ (btest test-basic test-tool)	5m 51s
Windows 2022/Visual C++ 2022 (check)	3m 40s
Windows 2025/Visual C++ 2022 (test-bundled-gems)	7m 18s
Windows 2025/Visual C++ 2022 (check)	4m 43s
Windows result	3s
	21m 35s

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