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When the read path needs to follow a key into the ancestor timeline, it needs to wait for said ancestor to become active and aware of it's branching lsn. The logic is lifted into a separate function with it's own new error type. This is done because the vectored read path needs the same logic. It's also the reason for the newly introduced error type. When we'll switch the read path to proxy into `get_vectored`, we can remove the duplicated variants from `PageReconstructError`.