[Fix] mlflow attr

[yhna940]

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Motivation

This PR is written to update the attributes used in the mlflow callback class due to the update of the Ray framework to a new version.

Modification

• Updated the self.client and self.experiment_id attributes.
• Changed self.save_artifact to self.should_save_artifact.

Checklist

1. Pre-commit or other linting tools are used to fix the potential lint issues.
2. The modification is covered by complete unit tests. If not, please add more unit test to ensure the correctness.
3. If the modification has potential influence on downstream projects, this PR should be tested with downstream projects, like MMDet or MMCls.
   
4. The documentation has been modified accordingly, like docstring or example tutorials.

[codecov-commenter]

Codecov Report

❗ No coverage uploaded for pull request base (main@098cb73). Click here to learn what that means.
Patch has no changes to coverable lines.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #135   +/-   ##
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  Coverage        ?   61.65%           
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  Files           ?       63           
  Lines           ?     1961           
  Branches        ?      312           
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  Hits            ?     1209           
  Misses          ?      648           
  Partials        ?      104           

Flag	Coverage Δ
unittests	61.65% <0.00%> (?)

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[KKIEEK]

LGTM