Clean up GraphQL Runner specs

What does this MR do and why?

Describe in detail what your merge request does and why.

This MR cleans up some GraphQL specs that I had written before I was aware of the a_graphql_entity_for helper method. There is no change in functionality.

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How to set up and validate locally

Numbered steps to set up and validate the change are strongly suggested.

If tests pass, then everything should be OK.

MR acceptance checklist

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