[Gardening] Remove YieldingContinuation since that approach was disfavored to AsyncStream #37504
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Remove YieldingContinuation since that was found to be insufficient to accomplish the goals of custom-non-async-sources to be made into AsyncSequences.
Fun fact... this was already removed from the CMakeLists.txt so it wasn't being built! So this is not an ABI breaking change and really just a gardening change ;)
Resolves rdar://78174691