Core - Fixe raid markers persists after target dead causes issue with bots running off (#1845)

This PR fixes #1833 where bots could keep chasing a raid target icon
(usually skull) across very large distances or even different maps after
the mark was set. It replaces the previous attempt with a simpler design
that keeps values generic and moves context logic into triggers/actions.

Changes

- RtiTargetValue now ignores RTI targets that are farther than
sPlayerbotAIConfig->sightDistance from the bot or the master (same map
only), while still using AttackersValue::IsValidTarget and LOS checks.
- AttackersValue is reverted to its original behavior (no special RTI +
IsInCombat logic).
- RTI triggers only react to "rti target" in combat, as suggested in
review (“that condition should be check in trigger…”).
- AttackRtiTargetAction keeps a small local fallback: if "rti target" is
null, it resolves the raid icon directly from the group so chat commands
like “attack rti target” still work, including out of combat.

Behavior

- Bots no longer run across the world to chase a stale skull far away
from the group.
- When the group comes back near the marked mob (within sight distance),
the skull is again used as a normal focus hint.
- Automatic RTI behavior is limited to combat via triggers, while
explicit chat commands still work out of combat.

Testing

- Marked a mob with skull, killed it, moved far away / changed zone,
then let it respawn: bots did not chase it from afar.
- In a normal dungeon/raid pack, bots still focus skull in combat.
- Passing near a previously marked mob: bots only react once it is back
within sight distance.

---------

Co-authored-by: Keleborn <22352763+Celandriel@users.noreply.github.com>

src/strategy/values/RtiTargetValue.cpp

@@ -64,5 +64,15 @@ Unit* RtiTargetValue::Calculate()
                                              sPlayerbotAIConfig->sightDistance))
         return nullptr;
 
+    // Also prevent chasing raid icon targets that are too far away from the master,
+    // even if they are technically visible to the bot.
+    if (Player* master = botAI->GetMaster())
+    {
+        if (master->IsInWorld() && master->GetMapId() == unit->GetMapId() &&
+            sServerFacade->IsDistanceGreaterThan(sServerFacade->GetDistance2d(master, unit),
+                sPlayerbotAIConfig->sightDistance))
+            return nullptr;
+    }
+
     return unit;
 }