DB/Quest: Blending In

* Credit now given the proper way using areatriggers rather than using ooc los on npcs result, credit is now given wether or not player is wearing shroud rather than only working if player does not use shroud as the credit npc cannot see shrouded player
* Added the Detect Shrouded Player to En'kilah Abomination so these are now visible to shrouded players and will attack

Closes https://github.com/TrinityCore/TrinityCore/issues/10227