Apple Inc. is preparing to finally bring one of its most ambitious projects to market: a series of cellular modem chips that will replace components from longtime partner — and adversary — Qualcomm Inc.More than half a decade in the making, Apple’s in-house modem system will debut next spring, according to people familiar with the matter. The component is slated to be part of the iPhone SE, the company’s entry-level smartphone, which will be updated next year for the first time since 2022....