With disallow_untyped_defs, warn for missing return types on async def #4218
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Fixes #4209.
Under disallow_untyped_defs, we were missing errors for missing return
types on async def functions, because the return type of such functions
is Awaitable[Any] instead of Any.
This PR also removes a duplicate test case (apparently from the fast
parser cleanup) and adds some missing annotations to stubs.