ST. PAUL — One of Khaled El-Ahmad’s shrewdest transactions received more validation on Friday. Minnesota United left wingback Anthony Markanich was announced as an MLS All-Star for the showcase game in Charlotte, N.C., on July 29. The 26-year-old Illinois native was named a First XI player based on total votes from MLS fans, media members and players. El-Ahmad, the Loons’ Chief Soccer Officer, sent only $50,000 to St. Louis City in a trade for M…