🐛 Replace get_all_metrics in MLflowMetricsHistoryDataset to be compatible with all Mlflow stores (#582)

[Galileo-Galilei]

Description

Close #582

Development notes

What have you changed, and how has this been tested?

Checklist

• Read the contributing guidelines
• Open this PR as a 'Draft Pull Request' if it is work-in-progress
• Update the documentation to reflect the code changes
• Add a description of this change and add your name to the list of supporting contributions in the CHANGELOG.md file. Please respect Keep a Changelog guidelines.
• Add tests to cover your changes

Notice

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[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (f066d7d) to head (996d4b9).

Additional details and impacted files

@@            Coverage Diff            @@
##            master      #591   +/-   ##
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  Coverage   100.00%   100.00%           
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  Files           29        29           
  Lines         1032      1026    -6     
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- Hits          1032      1026    -6     

Flag	Coverage Δ
	100.00% <100.00%> (ø)

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