fix(Scripts/ShadowLabyrinth): Improve Grandmaster Vorpil script (#16126)

fixed boss moving after teleporting and interrupting fire storm
void travelers will cast empowering shadow on vorpil
shadow nova animation now works
fixed spell cast order as described in the vorpil issue [Shadow Labyrinth] Grandmaster Vorpil #15928
vorpil will use draw shadows to summon players instead of having them manually summoned

data/sql/updates/pending_db_world/rev_1682776739497561100.sql

@@ -0,0 +1,10 @@
+--
+DELETE FROM `spelldifficulty_dbc` WHERE `ID` IN (33617, 33783);
+INSERT INTO `spelldifficulty_dbc` (`ID`, `DifficultySpellID_1`, `DifficultySpellID_2`) VALUES
+(33617, 33617, 39363),
+(33783, 33783, 39364);
+
+DELETE FROM `spell_custom_attr` WHERE `spell_id` IN (33783, 39364);
+INSERT INTO `spell_custom_attr` (`spell_id`, `attributes`) VALUES
+(33783, 4194304),
+(39364, 4194304);