feat: add experimental marker to all storage box commands

[apricote]

See #1202

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 69.62%. Comparing base (62a0819) to head (b78f79b).
⚠️ Report is 13 commits behind head on storage-boxes.

Additional details and impacted files

@@                Coverage Diff                @@
##           storage-boxes    #1203      +/-   ##
=================================================
+ Coverage          69.59%   69.62%   +0.02%     
=================================================
  Files                311      311              
  Lines              13983    13983              
=================================================
+ Hits                9732     9735       +3     
+ Misses              3309     3307       -2     
+ Partials             942      941       -1     

Flag	Coverage Δ
e2e	49.53% <100.00%> (+0.02%)	⬆️
unit	64.27% <100.00%> (+0.02%)	⬆️

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