By Jordan Valinsky, CNN New York (CNN) — When incoming Lululemon CEO Heidi O’Neill starts her new job on Tuesday, she will have a lot of heavy lifting to do. Last week, the struggling athleisure brand reported another dismal earnings report, posting a 12% drop in sales in North America and slashing its full-year outlook for the second time in three months. Shares fell roughly 20% on Friday, with the stock hovering at an eight-year low. Lululemon…