Kid Cudi is the latest celebrity being called to testify at Sean “Diddy” Combs ′ sex trafficking trial in New York. The popular melodic rapper is expected to take the stand Thursday and tell the jury about his brief relationship 14 years ago with Combs’ ex-girlfriend, the R&B singer Cassie. According to court filings and testimony, the Cassie-Cudi relationship, which grew out of the two working on music together, sent Combs into rages in which he beat her. Prosecutors contend that Combs was so