[ToGC] Nerubian Burrower Behaviour

The Problem:
- Currently I noticed shadow strike ability is always cast after they submerge or worst case is unpredictable
- They cast shadow strike on anubarak submerge
*Currently I don't have the proof on encounter, on next raid togc I'll record it and send it on comment

How it should work:
- Shadow strike timer should be always 30s and will not be cast when anubarak submerge
- If we silence / stun the burrower before they cast, they should not cast until the next timer

How to reproduce:
- Enter togc 10 or 25 and encounter anubarak, set clockwatch or something to track the timer

Character the bug occured on:
Wenshach

Reference:
- https://www.mmo-champion.com/threads/674983-Any-good-Hardmode-Anub-Arak-25-man-guides-Or-some-helpful-tips/page2?p=6869828

Nerubian Burrower behaviour is now expected to:

• Not Casting Shadow Strike while Anub is on Burrow State (Except the cast already begin few sec before Burrow Trigger)
• Timer Cast Spell of Shadow Strike Expected to be Fixed at 30s

Update Applied