Make assassins use noctis shurikens

[Arcanorum]

Task description

Assassins (and Master Assassin) currently use the generic "Shuriken" projectile as one of their special attacks. They should instead use the new "NoctisShuriken" projectile.

References/notes

Assassin logic file: https://github.com/Arcanorum/dungeonz/blob/master/server/src/entities/classes/destroyables/movables/characters/mobs/Assassin.js Assassin logic file: https://github.com/Arcanorum/dungeonz/blob/master/server/src/entities/classes/destroyables/movables/characters/mobs/MasterAssassin.js

Acceptance criteria

• Assassin mob should use the NoctisShuriken projectile as their optional attack.
• Master Assassin mob should use the NoctisShuriken projectile as their special attack.

[Arcanorum]

Blocked for now by #148