[Rust][DataFusion] Change tests in sql.rs to use `assert_batch`

[asfimport]

The idea is to make the tests in sql.rs more maintainable by using the assert_batches_eq macro that was introduced here: #9264

Reporter: Andrew Lamb / @alamb

_{Note: This issue was originally created as ARROW-11716. Please see the migration documentation for further details.}

[thisisnic]

Closing this issue as Rust development has moved to apache/arrow-rs and Datafusion to apache/datafusion.

If this is still relevant, feel free to open a new issue in one of those repos. Thanks!