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ARROW-10596: [Rust] Improve take benchmark

This fixes 3 issues on the take benchmark:

1. it is always taking the same element (indices is a constant vector), which is very easy to speculatively predict what the element is going to be.
2. It also does not compare with vs without nulls
3. all elements of the array are equal, which is again easy to speculatively predict

Closes #8669 from jorgecarleitao/fix_take_kernel

Authored-by: Jorge C. Leitao <jorgecarleitao@gmail.com>
Signed-off-by: Jorge C. Leitao <jorgecarleitao@gmail.com>