ARROW-11317: [Rust] Include the prettyprint feature in CI Coverage
ARROW-11317: [Rust] Include the prettyprint feature in CI Coverage

This PR changes the Rust CI job to include the prettyprint feature. (so we have CI coverage of that feature)

As @paddyhoran  noted, passing in feature flags to the root workspace doesn't do anything, and as it turns out we already invoke `cargo test` for the `arrow` crate separately. Prior to this PR I think that just ran the same tests again with the same features. After this PR, the second run of the arrow tests are run with the `prettyprint` feature

Here is evidence that the tests are running twice. I picked a PR (randomly)
https://github.com/apache/arrow/pull/9258/checks?check_run_id=1725967358

If you look at the logs for the run-tests action
![Screen Shot 2021-01-19 at 7 42 13 AM](https://user-images.githubusercontent.com/490673/105036642-c4188680-5a2a-11eb-8968-c570d855724e.png)

You can see that the same test is run twice:

```
2021-01-19T07:02:49.9476111Z test compute::kernels::boolean::tests::test_nonnull_array_is_not_null ... ok
2021-01-19T07:02:49.9476854Z test compute::kernels::boolean::tests::test_nonnull_array_is_null ... ok
2021-01-19T07:02:49.9477616Z test compute::kernels::boolean::tests::test_nonnull_array_with_offset_is_not_null ... ok
2021-01-19T07:02:49.9478427Z test compute::kernels::boolean::tests::test_nonnull_array_with_offset_is_null ... ok
2021-01-19T07:02:49.9479207Z test compute::kernels::boolean::tests::test_nullable_array_is_null ... ok
2021-01-19T07:02:49.9479948Z test compute::kernels::boolean::tests::test_nullable_array_is_not_null ... ok
2021-01-19T07:02:49.9480744Z test compute::kernels::boolean::tests::test_nullable_array_with_offset_is_not_null ... ok
2021-01-19T07:02:49.9481640Z test compute::kernels::boolean::tests::test_nullable_array_with_offset_is_null ... ok
2021-01-19T07:02:49.9487019Z test compute::kernels::boolean::tests::test_nullif_int_array_offset ... ok
2021-01-19T07:02:49.9487773Z test compute::kernels::boolean::tests::test_nullif_int_array ... ok
...
2021-01-19T07:07:23.4568865Z test compute::kernels::boolean::tests::test_nonnull_array_is_not_null ... ok
2021-01-19T07:07:23.4569576Z test compute::kernels::boolean::tests::test_nonnull_array_is_null ... ok
2021-01-19T07:07:23.4570337Z test compute::kernels::boolean::tests::test_nonnull_array_with_offset_is_not_null ... ok
2021-01-19T07:07:23.4571133Z test compute::kernels::boolean::tests::test_nonnull_array_with_offset_is_null ... ok
2021-01-19T07:07:23.4571885Z test compute::kernels::boolean::tests::test_nullable_array_is_not_null ... ok
2021-01-19T07:07:23.4572614Z test compute::kernels::boolean::tests::test_nullable_array_is_null ... ok
2021-01-19T07:07:23.4573383Z test compute::kernels::boolean::tests::test_nullable_array_with_offset_is_not_null ... ok
2021-01-19T07:07:23.4574183Z test compute::kernels::boolean::tests::test_nullable_array_with_offset_is_null ... ok
2021-01-19T07:07:23.4574929Z test compute::kernels::boolean::tests::test_nullif_int_array ... ok
2021-01-19T07:07:23.4575636Z test compute::kernels::boolean::tests::test_nullif_int_array_offset ... ok
```

Closes #9262 from alamb/alamb/run_prettyprint_ci

Authored-by: Andrew Lamb <02e0a999c50b1f88df7a8f5a04e1b76b35ea6a88@nerdnetworks.org>
Signed-off-by: Jorge C. Leitao <dfffc62510208f06492f17a48dc6ce87aa15abf6@gmail.com>

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