Hertz Global Holdings on Friday named former Goldman Sachs finance chief Stephen Scherr as its top boss, replacing interim CEO Mark Fields, sending shares of the car rental firm up 4 percent before the bell. Scherr will assume his new role as CEO and a board member on Feb. 28, Hertz said in a statement, adding that Fields would remain as a director. The leadership change comes at a time when rental car companies are dealing with a pandemic-driven surge in demand but are also grappling to secure vehicles due to global chip shortages and supply chain snarls. Hertz is also in the process of raising debt to refinance expensive preferred stock issued as part of the company’s exit from bankruptcy. The Florida-based company, which made a stock market return last year, was in the news in November after it placed an order for 100,000 electric rental cars from Tesla …