With the Support of Temirkhan Amantayevich Yelshibayev, General Director of the Republican Veterinary Laboratory, a Training Course on the Analysis of Sulfonamide, Nitroimidazole, Penicillin, Amphenicol, Quinolone, and Polypeptide Antibiotic Residues Using High-Performance Liquid Chromatography Coupled with Mass Spectrometry (HPLC–MS) Was Conducted at the Aktobe Regional Branch