HAYWARD, California — Biotech companies have chopped hundreds of jobs in the East Bay, raising the specter of economic struggles for an industry that had been seen as a bright spot and possible source of expansion in the region. Lonza Biologics and Personalis are among the most recent biotech companies to slash employment in the Bay Area, according to official WARN notices posted by the state Employment Development Department (EDD). The two companies have revealed plans to eliminate a combined 280 jobs, all in Alameda County, the EDD WARN notices state. Here are the details of the job cuts by …