fix: Explode list should take validity into account

[reswqa]

This is annoying, but ListArray does have two layouts.

This fixes #15454.

[codecov]

Codecov Report

Attention: Patch coverage is 98.36066% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 81.11%. Comparing base (44f1097) to head (89abdfb).
Report is 16 commits behind head on main.

Files	Patch %	Lines
...-core/src/chunked_array/ops/explode_and_offsets.rs	98.36%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #15572      +/-   ##
==========================================
- Coverage   81.16%   81.11%   -0.06%     
==========================================
  Files        1367     1367              
  Lines      175307   174978     -329     
  Branches     2527     2530       +3     
==========================================
- Hits       142296   141939     -357     
- Misses      32534    32563      +29     
+ Partials      477      476       -1     

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[codspeed-hq]

CodSpeed Performance Report

Merging #15572 will not alter performance

_{Comparing reswqa:list_explode_fix (89abdfb) with main (835d198)}

Summary

✅ 22 untouched benchmarks

[ritchie46]

Thanks a lot @reswqa!