[1.21.x] GlobalLootModifierProvider does not preserve the order of inserted entries

[Shadows-of-Fire]

The GLM provider does not record the order of inserted entries, meaning modders have no way to control the order of their GLMs from within their own mod when using datagen.

NeoForge/src/main/java/net/neoforged/neoforge/common/data/GlobalLootModifierProvider.java

Line 42 in 66ffb03

private final Map<String, WithConditions<IGlobalLootModifier>> toSerialize = new HashMap<>();

This HashMap should be a LinkedHashMap.

Realistically we should implement #697 but this is an issue with the current system as-is.