refactor(Core/Loot): Simplify GetFishLoot with for loop and merge Get…

[Kitzunu]

…FishLootJunk functionality

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[Tereneckla]

More a topic for #21216, but that is merged already

I don't think falling back to the defaultZone loot when there is no fishing loot because of conditions is the correct behavior.

wowhead does show brilliant smallfish and mudsnappers in tanaris, but the amount is more like a statistical error (or people actually fishing in a part of tanaris that blizzard deemed off the coast but wowhead not)

[sudlud]

@Tereneckla Well the 2 PRs are more there to repair and refactor the existing functionality for fishing loot, and the issue was about getting empty loot, which is now not happening anymore :)

But I agree, regarding tanaris the fishing loot is still a bit bugged, I'll prepare a PR for that