By Paresh Dave (Reuters) -The Biden administration must protect young adults who could lose U.S. immigration status because of processing delays for permanent residency, tech companies including Amazon.com Inc and Alphabet Inc’s Google said on Tuesday. After turning 21, foreigners can no longer stay in the United States under parents’ work visas. If applications for their own visas are not processed by that birthday – as is often happening amid pandemic-induced delays – they must leave. Unlike millions of undocumented immigrants popularly known as “Dreamers” who have become eligible for tempor…