Add unit tests for Union type look-up during queries

[BryceBeagle]

With the recent bug-fix in #1463, I noticed a lack of tests directly testing UnionDefinition.get_type_resolver and the function that it returns. We should add these.

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[patrick91]

I'm marking this as a potential good first issue, but I'm happy to help if someone wants to take this and they are stuck with something ^^

[aadityasinha-dotcom]

Can I work on this issue?

[patrick91]

@aadityasinha-dotcom sure! feel free to ping me on discord if you need some help :)

[aadityasinha-dotcom]

@aadityasinha-dotcom sure! feel free to ping me on discord if you need some help :)

Ok