Fix switchToLatest cancellation hangs - #55
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Persist iterator cancellation and atomically resume a waiting outer continuation so no replacement child task can outlive a cancelled consumer.\n\nAdd regressions for unfinished latest and non-cooperative outer sequences.
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Summary
switchToLatest()iteration when its consumer is cancelled while the outer or latest inner sequence remains openCloses #53
Testing
swift test --filter AsyncSwitchToLatestSequenceTestsswift test(134 tests)