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Replace Ractor.check_isolation with RUBY_RACTOR_CHECK_ISOLATION #468

Job	Run time
tarball	3m 12s
macos / macos (check, macos-26)	11m 50s
windows / Windows 2025-vs2026 (check)	26m 6s
non_development / non_development (no-ruby, true)	4m 25s
non_development / non_development (default, false)	3m 45s
windows / Windows 2022 (check)	28m 45s
ubuntu / ubuntu (test-bundler-parallel, ubuntu-22.04)	17m 33s
ubuntu / ubuntu (check, ubuntu-22.04)	9m 32s
ubuntu / ubuntu (test-bundled-gems, ubuntu-22.04)	8m 13s
ubuntu / ubuntu (check, ubuntu-24.04)	7m 23s
non_development / non_development (baseruby-no, false, --with-baseruby=no)	3m 6s
ubuntu / ubuntu (test-bundler-parallel, ubuntu-24.04)	18m 45s
ubuntu / ubuntu (test-bundled-gems, ubuntu-24.04)	7m 44s
	2h 30m 19s