fix(column lengths): autoscale array write to ncol for structured multi-model simulations

[jlarsen-usgs]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 56.1%. Comparing base (7eb7c88) to head (87837f3).
Report is 15 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #2507      +/-   ##
===========================================
- Coverage     76.1%    56.1%   -20.1%     
===========================================
  Files          296      640     +344     
  Lines        64215   124369   +60154     
===========================================
+ Hits         48885    69787   +20902     
- Misses       15330    54582   +39252     

Files with missing lines	Coverage Δ
flopy/mf6/mfmodel.py	80.9% <100.0%> (-3.1%)	⬇️

... and 474 files with indirect coverage changes

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