[ty] Reduce indentation of TypeInferenceBuilder::infer_attribute_load
#21560
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Summary
This PR is a pure refactor to reduce the amount of indentation and nested scopes in
TypeInferenceBuilder::infer_attribute_load. With this change, rustfmt is once again prepared to autoformat this function 🎉 (It gives up onmain.)The motivation here is to make the function more readable, and also make it easier to add more subdiagnostic hints when we report unresolved attributes.
Test Plan
All existing tests pass. This PR should have no functional change at all.