By Martin Baccardax Tesla said it had a record rate of production in June, but supply chain disruption and the closure of its Shanghai gigafactory triggered a slump in Q2 deliveries. Tesla (TSLA) – Get Tesla Inc. Report posted weaker-than-expected second quarter deliveries, the carmaker detailed Saturday, as the impact of plant closures in China and supply chain disruptions worldwide took its toll on production. Tesla delivered 254,695 new cars over the three months ending in June, the company said in a statement, up 26.7% from last year but down 17.7% from the record 310,048 tally reached ove…