fix(Core/Spells): correct hunter's Lock and Load procs (#8177)

- Move related code to spell scripts
- Fixes it proc'ing when the target is immune to snares
- Partial port of https://github.com/TrinityCore/TrinityCore/commit/746b838870e93d9843a089613ce7f1cd160b6ea5

data/sql/updates/pending_db_world/rev_1633019621598195500.sql

@@ -0,0 +1,5 @@
+INSERT INTO `version_db_world` (`sql_rev`) VALUES ('1633019621598195500');
+
+DELETE FROM `spell_script_names` WHERE `ScriptName` = 'spell_hun_lock_and_load' AND `spell_id` = -56342;
+INSERT INTO `spell_script_names` (`spell_id`, `ScriptName`) VALUES
+(-56342, 'spell_hun_lock_and_load');