Encode failed saneitizer updates with UpdateEvent.changeType = PAGE_RERENDER_UPSERT
Currently, the schema of the update stream does not allow this enum constant. Since the constant is used consumer-only, this patch makes sure we can write failed saneitizer updates to the update_failure stream.
Bug: T358599 Change-Id: I02bd8d54c6cd0f46eacf0fd667e8c9c9080e046d