President Joe Biden test drove an all-electric Cadillac SUV and slid into the front seat of a new Corvette as part of a mid-day tour Wednesday of Detroit’s resurrected auto show ahead of an afternoon speech on the auto industry’s transition to electric vehicles. In a speech on media day at the North American International Auto Show, Biden plans to announce $900 million in grants for electric vehicle chargers across 35 states, the White House said, the first round of $5 billion in funding appropriated through the bipartisan infrastructure law. On the auto show floor at Huntington Place, Biden, …