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ESQL: Ensure LOOKUP JOIN works with union types #128909

@alex-spies

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@alex-spies

Let's add tests that ensure that LOOKUP JOIN works with union types as the match field.

I think we don't use FieldAttribute#fieldName when constructing the lookup operator, which implies that union types currently don't work at all when used in the match field.

Relates #127521 and #127521

Required for #119082

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