fix (#1179): resolve bot stuttering in BGs after player death (#1269)

Fixes #1179

This update fixes several issues related to bot behavior in battlegrounds when the player dies and releases spirit:

- Removed conflicting strategies (+stay / +follow): Bots were being told to follow and stay simultaneously each tick, causing oscillating movement ("stuttering"). The +stay strategy is now skipped in BGs to allow bots to continue objectives normally.

- Disabled follow while in BG: When the player died, bots attempted to return to the player repeatedly, abandoning objective-based movement. PlayerbotAI now sets -follow while in BGs to keep bots engaged with the objectives.

- Prevented dead bots from following ghosts: Previously, dead bots would follow ghost players away from the graveyard and potentially miss Rez. Bots now wait at the spirit healer when dead in BGs.

- Removed redundant strategy changes and messages in ReleaseSpiritAction as they no longer apply in battleground contexts.

src/strategy/actions/ReleaseSpiritAction.cpp

@@ -19,8 +19,14 @@ bool ReleaseSpiritAction::Execute(Event event)
 {
     if (bot->IsAlive())
     {
-        botAI->TellMasterNoFacing("I am not dead, will wait here");
-        botAI->ChangeStrategy("-follow,+stay", BOT_STATE_NON_COMBAT);
+        if (!bot->InBattleground()) 
+        {
+            botAI->TellMasterNoFacing("I am not dead, will wait here");
+            // -follow in bg is overwriten each tick with +follow
+            // +stay in bg causes stuttering effect as bot is cycled between +stay and +follow each tick
+            botAI->ChangeStrategy("-follow,+stay", BOT_STATE_NON_COMBAT);
+        }
+
         return false;
     }