FDB-666 removed length from fdb-list json output

[danovaro]

Description

Contributor Declaration

By opening this pull request, I affirm the following:

• All authors agree to the Contributor License Agreement.
• The code follows the project's coding standards.
• I have performed self-review and added comments where needed.
• I have added or updated tests to verify that my changes are effective and functional.
• I have run all existing tests and confirmed they pass.

🌈🌦️📖🚧 Documentation FDB 🚧📖🌦️🌈
https://sites.ecmwf.int/docs/fdb/pull-requests/PR-279

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 71.06%. Comparing base (69ad05c) to head (ab348a2).

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #279      +/-   ##
===========================================
+ Coverage    70.99%   71.06%   +0.07%     
===========================================
  Files          371      371              
  Lines        23489    23486       -3     
  Branches      2462     2464       +2     
===========================================
+ Hits         16676    16691      +15     
+ Misses        6813     6795      -18     

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[tweska]

Thank you for addressing this issue! I don't need the length value in the output, but I don't know if anyone else is relying on it. Although I would think they also run into problems with the way it was formatted before.