Add Ractor.check_isolation #13239

Job	Run time
Windows 2022 (check)	24m 50s
Windows 2025-vs2026 (check)	23m 29s
Windows 2022 (test-bundled-gems)	11m 29s
Windows 2022 (VS2017 toolset)	8m 56s
Windows 2025-vs2026 (test-bundled-gems)	18m 11s
Windows 2022 (VS2019 toolset)	8m 12s
Windows 11-arm (btest test-basic test-tool)	17m 44s
Windows result	3s
	1h 52m 54s

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