Scripts/Quest: Force of Neltharaku quest credit (#24807)

* Scripts/Quest: Force of Neltharaku quest credit

**Description:**

Suggested solution to resolve the kill credit double cast issue
in the quest "The Force of Neltharaku" (10854).

by Rushor

**Changes proposed:**

- Remove duplicate spell casts in the zone quest script
- Remove commented-out script section
- Set a couple of unit flags (anim/stand/hover)
- Move return new creature script override to end of script
- Move PlayerGUID, FlyTimer, and Tapped to Private
- Add DB flight movement control to Enslaved Netherwing Drake
- Add SpellMgr MaxAffectedTargets = 1 for spell 38762
- Add movement enum POINT_MOVE_UP
- Add missing enum for quest ID

**Target branch(es):** 3.3.5/master

- [X] 3.3.5
- [X] master

**Issues addressed:** Closes #24796

**Tests performed:** (Does it build, tested in-game, etc.)

Pending for now.

**Known issues and TODO list:** (add/remove lines as needed)

- [X] Open PR in draft mode until testing is cleared
- [ ] Compile and create local server
- [ ] Test changes on local server

* Rename 9999_99_99_99_world.sql to 2020_07_29_00_world.sql

Co-authored-by: Rushor <Rushor@users.noreply.github.com>
Co-authored-by: Giacomo Pozzoni <giacomopoz@gmail.com>

sql/updates/world/3.3.5/2020_07_29_00_world.sql

@@ -0,0 +1,4 @@
+--
+-- The Force of Neltharaku: Enslaved Netherwing Drake (21722)
+UPDATE `creature_template_movement` SET `Flight`= 1 WHERE  `CreatureId`= 21722;
+UPDATE `creature_addon` SET `bytes1`= 0 WHERE  `guid` IN (SELECT `guid` FROM `creature` WHERE `id`= 21722);