This single mother of one, Lakisha Jones, came out quietly from behind the pack and blew everyone else away on stage – both the guys and the girls – with her cover of the “Dreamgirls” signature tune, “And I’m Telling You, I’m not Going” during week one of season 6 “American Idol” semifinals. Judge Simon Cowell so much as told the other 23 contestants to pack their bags and buy tickets home, following Jones’ rendition of the song made famous by former “Idol,” Jennifer Hudson. Mother to a 3-year-old daughter, Jones, 27, grew up in Flint, MI, where she works as a bank teller. She began singing