fix: format suggestions for ranking values

[frascuchon]

Description

This PR fixes problems with HF format when passing ranking value objects (instead of raw dictionaries).

Type of change

(Please delete options that are not relevant. Remember to title the PR according to the type of change)

• Bug fix (non-breaking change which fixes an issue)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

How Has This Been Tested

(Please describe the tests that you ran to verify your changes. And ideally, reference tests)

Tested locally

• Test A
• Test B

Checklist

• I followed the style guidelines of this project
• I did a self-review of my code
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• I filled out the contributor form (see text above)
• I have added relevant notes to the CHANGELOG.md file (See https://keepachangelog.com/)

[github-actions]

The URL of the deployed environment for this PR is https://argilla-quickstart-pr-4628-ki24f765kq-no.a.run.app

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.03%. Comparing base (254f719) to head (d1f2f69).

Additional details and impacted files

@@             Coverage Diff              @@
##           develop    #4628       +/-   ##
============================================
+ Coverage    45.26%   89.03%   +43.76%     
============================================
  Files          190      190               
  Lines        11671    11664        -7     
============================================
+ Hits          5283    10385     +5102     
+ Misses        6388     1279     -5109     

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