Improvements to antag-before-job selection system (#35822)

* Fix the latejoin-antag-deficit bug, add datafield, add logging

* Fix multiple roles being made for single-role defs,

Content.Shared.Database/LogType.cs

@@ -449,9 +449,14 @@ public enum LogType
     /// An atmos networked device (such as a vent or pump) has had its settings changed, usually through an air alarm
     /// </summary>
     AtmosDeviceSetting = 97,
-    
+
     /// <summary>
     /// Commands related to admemes. Stuff like config changes, etc.
     /// </summary>
     AdminCommands = 98,
+
+    /// <summary>
+    /// A player was selected or assigned antag status
+    /// </summary>
+    AntagSelection = 99,
 }