[Fixes #14339] Drop support Dropbox storage manager

[mattiagiupponi]

Checklist

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[gemini-code-assist]

Code Review

This pull request removes the Dropbox storage manager implementation, its associated unit tests, and the 'dropbox' dependency from the project configuration. I have no feedback to provide on these changes.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 74.92%. Comparing base (be64508) to head (fdc0d55).
⚠️ Report is 2 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff             @@
##           master   #14342       +/-   ##
===========================================
+ Coverage   34.71%   74.92%   +40.21%     
===========================================
  Files         982      982               
  Lines       60496    60538       +42     
  Branches     8247     8258       +11     
===========================================
+ Hits        21002    45360    +24358     
+ Misses      38332    13348    -24984     
- Partials     1162     1830      +668     

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