ARROW-12400: [Rust] Re-enable tests in arrow::array::transform
ARROW-12400: [Rust] Re-enable tests in arrow::array::transform

These tests were all commented out in #9329. Given the PR made changes to the commented out code, I'm inclined to think this was an accidental omission? If not, happy for this to be closed :grinning:

FYI @jorgecarleitao

Signed-off-by: Raphael Taylor-Davies <d0bb0a6fd3446defe7e9f6ff7e79bb26786a04d9@googlemail.com>

Closes #10048 from tustvold/enable-transform-tests

Authored-by: Raphael Taylor-Davies <d0bb0a6fd3446defe7e9f6ff7e79bb26786a04d9@googlemail.com>
Signed-off-by: Andrew Lamb <02e0a999c50b1f88df7a8f5a04e1b76b35ea6a88@nerdnetworks.org>

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