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/FollowActions.cpp

@@ -100,6 +100,10 @@ bool FollowAction::isUseful()
 
 bool FollowAction::CanDeadFollow(Unit* target)
 {
+    // In battleground, wait for spirit healer
+    if (bot->InBattleground() && !bot->IsAlive())
+        return false;
+
     // Move to corpse when dead and player is alive or not a ghost.
     if (!bot->IsAlive() && (target->IsAlive() || !target->HasFlag(PLAYER_FLAGS, PLAYER_FLAGS_GHOST)))
         return false;