Utah’s GOP Rep. Jason Chaffetz, retiring from Congress on June 30, will become a contributor to Fox News Channel and Fox Business Network on July 1, the network announced today, confirming one of the worst kept secrets in recent TV-news history. Chaffetz had represented Utah's Third Congressional District since November of 2008. From Fox News’ announcement: During his time as congressman, he served as the Chairman of the House Oversight and Government Reform Committee…