fix(DB/Creature): Necrotic Shard is sometimes regenerating health (#22812)

data/sql/updates/pending_db_world/rev_1757124004480055823.sql

@@ -0,0 +1,2 @@
+--
+UPDATE `creature_template` SET `RegenHealth` = 0 WHERE (`entry` IN (16136, 16172));

src/server/scripts/World/scourge_invasion.cpp

@@ -362,7 +362,6 @@ struct npc_necrotic_shard : public ScriptedAI
     {
         scheduler.Schedule(5s, [this](TaskContext context) // Spawn Cultists every 60 minutes.
         {
-            me->SetFullHealth();
             DespawnShadowsOfDoom(); // Despawn all remaining Shadows before respawning the Cultists?
             SummonCultists();
             context.Repeat(1h);