[windows][test] Unsupport async_task_yield in OS=windows-msvc

The test crashes in both the VS2017 and VS2019 CI machines.

See https://bugs.swift.org/browse/SR-14333 for more of these problems.

Author: drodriguez

test/Concurrency/Runtime/async_task_yield.swift

@@ -3,6 +3,9 @@
 // REQUIRES: executable_test
 // REQUIRES: concurrency
 
+// https://bugs.swift.org/browse/SR-14333
+// UNSUPPORTED: OS=windows-msvc
+
 @available(macOS 9999, iOS 9999, watchOS 9999, tvOS 9999, *)
 protocol Go: Actor {
   func go(times: Int) async -> Int