By Terje Solsvik OSLO (Reuters) -U.S. auto maker Tesla Inc should respect fundamental labour rights, including collective bargaining, Norway’s $1.5 trillion sovereign wealth fund, the world’s biggest stock market investor, told Reuters on Friday. The electric vehicle producer faces a backlash in the Nordic region from unions and some pension funds over its refusal to accept a demand from Swedish mechanics for collective bargaining rights covering wages and other conditions. Norges Bank Investment Management, which operates the Norwegian fund, is Tesla’s 7th biggest shareholder with a 0.88% sta…