refactor(biome_graphql_parser): use is_nth_at_* #2795
Merged
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Summary
Some parsing rule pre-conditions was difficult to understand because certain definitions optionally have a description located right before them. This PR refactors those precondition using th NthAt trait, making them easier to comprehend and also fixing a subtle bug where the parser failed to recognize an object attribute preceded by a description.
Test Plan
All tests should pass.