[ENH] Added ReprMixin to share __repr__ formatting

[JATAYU000]

Metadata

• Reference Issue: Fixes [ENH] Add ReprMixin to share __repr__ formatting across OpenML classes #1591
• New Tests Added: No
• Documentation Updated: Yes (docstring)
• Change Log Entry: Adds ReprMixin in utils

Details

• Any other comments?
  Had a question, Can I make the classes use the mixin in this pr or should I open a new one?

[codecov-commenter]

Codecov Report

❌ Patch coverage is 44.44444% with 10 lines in your changes missing coverage. Please review.
✅ Project coverage is 51.99%. Comparing base (c5f68bf) to head (13745f8).

Files with missing lines	Patch %	Lines
openml/utils.py	44.44%	10 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1595      +/-   ##
==========================================
- Coverage   53.02%   51.99%   -1.04%     
==========================================
  Files          36       36              
  Lines        4326     4343      +17     
==========================================
- Hits         2294     2258      -36     
- Misses       2032     2085      +53     

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[geetu040]

@fkiraly the CI failures are coming from the production server - specifically database connection - probably because of overloading. Should we do something about these in short-term or just leave it for long-term test refactor?