[c2969] Drop gossip for learning/unlearning advanced tailor skills

This will be handled by database

Signed-off-by: Xfurry <xfurry@scriptdev2.com>

(based on commit SD2-WotLK [2969] - 4bda99c)

Signed-off-by: Xfurry <xfurry@scriptdev2.com>