Do not add auxiliary cell to uploaded/generated structures

[danielhollas]

If such functionality is needed, it must be optional.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.21%. Comparing base (7c9a3ef) to head (f70accc).
Report is 5 commits behind head on master.

❗ Current head f70accc differs from pull request most recent head bf63f0d

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Additional details and impacted files

@@           Coverage Diff           @@
##           master     #592   +/-   ##
=======================================
  Coverage   96.21%   96.21%           
=======================================
  Files          11       11           
  Lines        1188     1188           
=======================================
  Hits         1143     1143           
  Misses         45       45           

Flag	Coverage Δ
python-3.10	96.21% <ø> (ø)
python-3.9	96.21% <ø> (ø)

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