[SourceKit] Update completion cancellation test to a harder type checking example #76494
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#63585 will resolve rdar://80582770 and the type checker performance problem that we were relying on. Use a harder example (stolen from https://github.com/swiftlang/swift/blob/main/unittests/SourceKit/SwiftLang/CloseTest.cpp#L131-L151), that’s unlikely to get a significant performance improvement soon.