Instacart elevated a former Uber Technologies Inc. veteran to chief financial officer, replacing Nick Giovanni who is retiring. The grocery delivery company also reported first-quarter revenue that beat analysts’ estimates.Emily Reuter, who joined Instacart as vice president of finance six months ago, will take on the new role this week, Instacart said in a statement. Giovanni, who helped shepherd Instacart through its initial public offering last year, is retiring after three years at the compa...