ReactiveX / rxjs / 5777

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refactor(Observable): toPromise and forEach return Promise not PromiseLike (#3434)

Unfortunately this requires a cast because we don't want to specify PromiseConstructor, because that comes with a bunch of statics that are optional, so we use PromiseConstructorLike, however that returns a PromiseLike, and we want to ensure that the returned promise also has a `catch` method and isn't just a thennable.

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