[3.3.5][6.x]Scripts/Karazhan: Implement Optional Boss Spawn (cherry picked from commit c8f34656ef0ec0496e3d129b92ec389748b8caf5)
[3.3.5][6.x]Scripts/Karazhan: Implement Optional Boss Spawn (cherry picked from commit c8f34656ef0ec0496e3d129b92ec389748b8caf5)