fix(ICC/Sindragosa): add a cooldown to proccing Unchained Magic (#18901)

* add cooldown to proc

* convert to spell and aurascript pair macro

* remove no longer needed validate override

* set cooldown with Cooldown field in table spell_proc_event

data/sql/updates/pending_db_world/rev_1716477609336515289.sql

@@ -0,0 +1,2 @@
+--
+UPDATE `spell_proc_event` SET `Cooldown`=600 WHERE `entry`=69762;