By Martin Baccardax “This was an *exceptionally* difficult quarter due to supply chain interruptions & China zero Covid policy,” said CEO Elon Musk. Tesla (TSLA) – Get Tesla Inc Report unveiled record first quarter deliveries Saturday, shifting more than 310,000 units, as the clean-energy carmaker avoided the worst of delays from its Covid-hit factory in Shanghai amid what CEO Elon Musk called an “exceptionally” difficult start to the year. Tesla delivered 310,048 new cars over the three months ending in March, the company said in a statement, up 67.8% from last year but just 0.5% higher than …