By Hannah Lang and Suzanne McGee WASHINGTON/NEW YORK (Reuters) -The U.S. securities regulator on Wednesday approved the first U.S.-listed exchange traded funds (ETFs) to track bitcoin, in a watershed for the world’s largest cryptocurrency and the broader crypto industry. The Securities and Exchange Commission said it approved 11 applications, including from BlackRock, Ark Investments/21Shares, Fidelity, Invesco and VanEck, despite warnings from some officials and investor advocates that the products carried risks. Most of the products are expected to begin trading Thursday, issuers said, kicki…