[Magtheridon] Black Sack of Gems shouldn't drop from Magtheridon during this part of progression

Originally reported on CC at: https://github.com/chromiecraft/chromiecraft/issues/5932
By: [balleny](https://github.com/balleny)

Open to discussion, naturally.

### What client do you play on?

enUS

### Faction

Both

### Content Phase:

70

### Current Behaviour

https://wowgaming.altervista.org/aowow/?item=34846 contains epic gems which should not be available at the current phase.
further, the satchel itself was only introduced with patch 2.3.3 (Zul Aman)

### Expected Blizzlike Behaviour

easiest solution right now would be to keep the satchel dropping from magtheridon, but remove the epic gems from the satchel until ZA release.

### Source

https://wowpedia.fandom.com/wiki/Black_Sack_of_Gems
https://wowgaming.altervista.org/aowow/?item=34846#contains

### Steps to reproduce the problem

.

### Extra Notes

on wow classic, they initially released the "old" back without epic gems
https://www.wowhead.com/tbc/item=34846/black-sack-of-gems#see-also
and then introduced a new version containing epic gems
https://www.wowhead.com/tbc/item=191060/black-sack-of-gems

### AC rev. hash/commit

https://github.com/chromiecraft/azerothcore-wotlk/commit/a8964a6ed1dc9295a85a816e5d11740e90a1fb79

### Operating system

Ubuntu 20.04

### Modules

- [mod-ah-bot](https://github.com/azerothcore/mod-ah-bot)
- [mod-bg-item-reward](https://github.com/azerothcore/mod-bg-item-reward)
- [mod-BreakingNewsOverride](https://github.com/AnchyDev/BreakingNewsOverride)
- [mod-cfbg](https://github.com/azerothcore/mod-cfbg)
- [mod-chat-transmitter](https://github.com/azerothcore/mod-chat-transmitter)
- [mod-cta-switch](https://github.com/azerothcore/mod-cta-switch)
- [mod-desertion-warnings](https://github.com/azerothcore/mod-desertion-warnings)
- [mod-duel-reset](https://github.com/azerothcore/mod-duel-reset)
- [mod-eluna](https://github.com/azerothcore/mod-eluna)
- [mod-instanced-worldbosses](https://github.com/nyeriah/mod-instanced-worldbosses)
- [mod-ip-tracker](https://github.com/azerothcore/mod-ip-tracker)
- [mod-low-level-arena](https://github.com/azerothcore/mod-low-level-arena)
- [mod-low-level-rbg](https://github.com/azerothcore/mod-low-level-rbg)
- [mod-multi-client-check](https://github.com/azerothcore/mod-multi-client-check)
- [mod-progression-system](https://github.com/azerothcore/mod-progression-system)
- [mod-pvp-titles](https://github.com/azerothcore/mod-pvp-titles)
- [mod-pvpstats-announcer](https://github.com/azerothcore/mod-pvpstats-announcer)
- [mod-queue-list-cache](https://github.com/azerothcore/mod-queue-list-cache)
- [mod-rdf-expansion](https://github.com/azerothcore/mod-rdf-expansion)
- [mod-transmog](https://github.com/azerothcore/mod-transmog)
- [mod-weekend-xp](https://github.com/azerothcore/mod-weekend-xp)
- [mod-zone-difficulty](https://github.com/azerothcore/mod-zone-difficulty)
- [lua-carbon-copy](https://github.com/55Honey/Acore_CarbonCopy)
- [lua-event-scripts](https://github.com/55Honey/Acore_eventScripts)
- [lua-exchange-npc](https://github.com/55Honey/Acore_ExchangeNpc)
- [lua-level-up-reward](https://github.com/55Honey/Acore_LevelUpReward)
- [lua-recruit-a-friend](https://github.com/55Honey/Acore_RecruitAFriend)
- [lua-send-and-bind](https://github.com/55Honey/Acore_SendAndBind)
- [lua-temp-announcements](https://github.com/55Honey/Acore_TempAnnouncements)
- [lua-zonecheck](https://github.com/55Honey/acore_Zonecheck)

### Customizations

None

### Server

ChromieCraft

Start by tracing the Magtheridon loot configuration in the progression system and inspect item 34846 and its contents for phase 70. Compare the configured reward with the issue's expected pre-Zul'Aman behavior, then verify that epic gems are unavailable until the appropriate progression release.

Written by the indexing model from the issue text.