On a rainy Wednesday in February, about a dozen Uber and Lyft drivers parked their cars in the garage of a New York City skyscraper and gathered in a 47th-floor office with floor-to-ceiling windows. The drivers, who had 170 years of professional driving experience between them, were offered glasses of water and snacks, interviewed individually by nodding employees using iPads as notebooks, and funneled into a conference room to hear a pitch about Juno, a…