12:23pm: The Giants formally announced that Miller has been selected from Sacramento and Waites has been optioned there in his place. 12:21pm: The Giants are selecting the contract of veteran right-hander Shelby Miller from Triple-A Sacramento prior to Thursday’s game against the Rockies. Susan Slusser of the San Francisco Chronicle tweeted earlier that Miller was in the clubhouse, and Andrew Baggarly of The Athletic now adds that Miller has been informed he’ll be active for today’s game (and not simply on the taxi squad). The Giants designated outfielder Lewis Brinson for assignment yesterday, so they already have an open spot…