Use concat_elements_utf8 from arrow rather than custom kernel

[alamb]

Which issue does this PR close?

re #1474

Rationale for this change

I noticed #3026 (comment) that datafusion is not yet using the great concat_elements kernel added by @ismailmaj in apache/arrow-rs#1720

What changes are included in this PR?

Use arrow kernel, remove custom datafusion one

Are there any user-facing changes?

No

[codecov-commenter]

Codecov Report

Merging #3036 (c77ef6c) into master (d07a775) will decrease coverage by 0.00%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #3036      +/-   ##
==========================================
- Coverage   85.85%   85.84%   -0.01%     
==========================================
  Files         286      286              
  Lines       51670    51658      -12     
==========================================
- Hits        44360    44347      -13     
- Misses       7310     7311       +1     

Impacted Files	Coverage Δ
...on/physical-expr/src/expressions/binary/kernels.rs	63.15% <ø> (-8.85%)	⬇️
datafusion/physical-expr/src/expressions/binary.rs	97.88% <100.00%> (ø)
datafusion/expr/src/window_frame.rs	92.43% <0.00%> (-0.85%)	⬇️
datafusion/expr/src/logical_plan/plan.rs	77.60% <0.00%> (ø)

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[ursabot]

Benchmark runs are scheduled for baseline = d07a775 and contender = b2be7ab. b2be7ab is a master commit associated with this PR. Results will be available as each benchmark for each run completes.
Conbench compare runs links:
[Skipped ⚠️ Benchmarking of arrow-datafusion-commits is not supported on ec2-t3-xlarge-us-east-2] ec2-t3-xlarge-us-east-2
[Skipped ⚠️ Benchmarking of arrow-datafusion-commits is not supported on test-mac-arm] test-mac-arm
[Skipped ⚠️ Benchmarking of arrow-datafusion-commits is not supported on ursa-i9-9960x] ursa-i9-9960x
[Skipped ⚠️ Benchmarking of arrow-datafusion-commits is not supported on ursa-thinkcentre-m75q] ursa-thinkcentre-m75q
Buildkite builds:
Supported benchmarks:
ec2-t3-xlarge-us-east-2: Supported benchmark langs: Python, R. Runs only benchmarks with cloud = True
test-mac-arm: Supported benchmark langs: C++, Python, R
ursa-i9-9960x: Supported benchmark langs: Python, R, JavaScript
ursa-thinkcentre-m75q: Supported benchmark langs: C++, Java