DB/Quests: Fixes Through the Eye (13121), closes #9070

Thanks @Kirkhammet for inital work
Scripts/Eye of Eternity: Surge of Power (25 man)

* I have no idea how these breaks were removed, but it was breaking the whole mechanic.
* Also fix some slight chance for fail of transitioning p II -> p III
* Surge of Power (25 man) still needs to get fixed some weird facing and warnings aren't always sent for some reason
Scripts/Eye of Eternity: Remove some flags, fix some timers and some misc

* Starting timers were a bit slower
* Destroy platform proper timing for drake casting mount spell to player (trigger)
* Remove IMMUNITY_PC flag after Iris is triggered (thx to Expecto) and readd it on evade
* Remove NOT_SELECTABLE flag since shouldn't be present at starting event
* Fix misc of id of Static Field added to LOS attributes
DB/Quests: Fixes To Legion Hold (10563,10596). Closes #9153,  #6909

Thanks @Kirkhammett for the initial work.
Core/Vehicles: Defined known seat flag VEHICLE_SEAT_FLAG_IS_USING_VEHICLE_CONTROLS
Merge branch 'master' of github.com:TrinityCore/TrinityCore into 4.3.4