fix(Scripts/ShatteredHalls): fix some timers/mechanics of Grand Warlock Nethekurse

[elthehablo]

Note: this is likely my last commit to this (other than cleaning codestyle. So it either has to be merged and then improved on or closed. I am sorry, but this is my current limit in AC scripting knowledge lol.

Changes Proposed:

• timers changed according to https://github.com/azerothcore/azerothcore-wotlk/issues/16070
• also changed mechanics according to same issue

Issues Addressed:

• Progress https://github.com/azerothcore/azerothcore-wotlk/issues/16070

SOURCE:

see issue

Tests Performed:

• testing done by me. events work
• RP is still broken and is basically unaltered

How to Test the Changes:

Known Issues and TODO List:

• [x] RP still missing
• [ ] RP and movement is wonky and needs to be fixed (specifically him flying at some locations)
• [x] Make less commits next time
• [ ] Some lines fire multiple times
• [ ] Peon engaged line fires when boss casts Death Coil (probably have to implement a check for the unit that is attacking)
• [x] Fight is doable and timers for fight are correct

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