language: Add fallback for enum member completion highlight

[xdBronch]

i tried to use variant but it wasnt giving any color despite my theme definitely having a color for it, am i doing something wrong? i think property is an alright fallback
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after:

Release Notes:

• N/A

[xdBronch]

i think i somewhat understand whats happening with variant, my treesitter highlights dont use it anywhere so its not loaded. if i have match something to variant then it works here. anyone know how you might fix that? should it be a separate issue?

[SomeoneToIgnore]

Thank you.

I think variant is what has to be queried first, and only then we can fall back to property.

The code for that is on the line above with the or_else(|| .. usage, let's do that and merge the PR.