fix(Scripts/BlackwingLair): Razorgore improvements (#10971)

- Rewrite reset events
- Use proper healing spell on phase transition
- Now uses abilities during phase 1
- Phase transition scripted - mobs now run away

src/server/game/Spells/SpellInfoCorrections.cpp

@@ -4243,6 +4243,12 @@ void SpellMgr::LoadSpellInfoCorrections()
         spellInfo->Effects[EFFECT_0].DieSides = 1250;
     });
 
+    // Explosion - Razorgore
+    ApplySpellFix({ 20038 }, [](SpellInfo* spellInfo)
+    {
+        spellInfo->Effects[EFFECT_0].RadiusEntry = sSpellRadiusStore.LookupEntry(EFFECT_RADIUS_50000_YARDS);
+    });
+
     for (uint32 i = 0; i < GetSpellInfoStoreSize(); ++i)
     {
         SpellInfo* spellInfo = mSpellInfoMap[i];