Incorrect handling of ReturnStatement check in an async function

[rbuckton]

From lensapp/lens:

• src/common/k8s-api/endpoints/metrics.api.ts#L85 - Due to an inference issue in Adds 'Awaited' type alias and updates to Promise.all/race/allSettled/any #45350 as a result of getAwaitedType returning an Awaited<T> instantiation when checking return statements.

Originally posted by Ron Buckton (@rbuckton) in #45846 (comment)

We're checking return type assignability and end up with a T from unwrapping the return type annotation but an Awaited<T> from checking the ReturnStatement's expression.