feat(Core/Config): Add configurable XP rate for battleground objectives (#24672)

src/server/game/World/WorldConfig.cpp

@@ -64,6 +64,7 @@ void WorldConfig::BuildConfigCache()
     SetConfigValue<float>(RATE_XP_EXPLORE, "Rate.XP.Explore", 1.0f);
     SetConfigValue<float>(RATE_XP_PET, "Rate.XP.Pet", 1.0f);
     SetConfigValue<float>(RATE_XP_PET_NEXT_LEVEL, "Rate.Pet.LevelXP", 0.05f);
+    SetConfigValue<float>(RATE_XP_BATTLEGROUND_BONUS, "Rate.XP.BattlegroundBonus", 1.0f);
     SetConfigValue<float>(RATE_REPAIRCOST, "Rate.RepairCost", 1.0f, ConfigValueCache::Reloadable::Yes, [](float const& value) { return value >= 0.0f; }, ">= 0");
 
     SetConfigValue<float>(RATE_SELLVALUE_ITEM_POOR, "Rate.SellValue.Item.Poor", 1.0f);

src/server/game/World/WorldConfig.h

@@ -437,6 +437,7 @@ enum ServerConfigs
     RATE_XP_EXPLORE,
     RATE_XP_PET,
     RATE_XP_PET_NEXT_LEVEL,
+    RATE_XP_BATTLEGROUND_BONUS,
     RATE_REPAIRCOST,
     RATE_REPUTATION_GAIN,
     RATE_REPUTATION_GAIN_AB,