A former NYPD officer was convicted of perjury Friday for lying about the circumstances of a 2009 shooting in a trial that featured The Post’s exclusive reporting on the tall tale. Danny Acosta was found guilty of a slew of charges in a Bronx criminal courtroom by a jury in connection to the statements he made about shooting a 17-year-old boy inside the stairwell at a Claremont public housing complex, the district attorney’s office said. Acosta claimed for years – including to a grand jury and as part of a civil lawsuit – that teen suspect Peter Colon held a gun to his partner’s head, forcing him to open fire on Colon from 10 feet away, legal papers said. He and his partner claimed in civil depositions that during a struggle between Acosta’s partner and Colon that the teen picked up her gun that she dropped and pressed it against her head, according to past Post reporting. The officer offered a different version of events connected to the 2009 shooting for years.…