refactor(Core/AI): Some more refactoring prep for Comat Threat system… (#15026)

Co-authored-by: Treeston <14020072+Treeston@users.noreply.github.com>

src/server/scripts/Outland/boss_doomwalker.cpp

@@ -84,7 +84,7 @@ public:
             Talk(SAY_DEATH);
         }
 
-        void EnterCombat(Unit* /*who*/) override
+        void JustEngagedWith(Unit* /*who*/) override
         {
             Talk(SAY_AGGRO);
         }