Sanitize argument-free object params before logging

[V0XNIHILI]

What does this PR do?

This PR sanitizes object params before they get logged to WandB and Neptune.

Fixes #19772

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I had fun coding :D

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📚 Documentation preview 📚: https://pytorch-lightning--19771.org.readthedocs.build/en/19771/

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 59%. Comparing base (a611de0) to head (08698f7).
Report is 94 commits behind head on master.

❗ There is a different number of reports uploaded between BASE (a611de0) and HEAD (08698f7). Click for more details.

HEAD has 99 uploads less than BASE

Flag	BASE (a611de0)	HEAD (08698f7)
python3.10	19	12
cpu	64	40
lightning	39	27
pytest	45	26
examples	8	0
app	8	0
python3.8	12	10
lightning_fabric	10	9
python3.11	20	18
tpu	1	0
pytorch2.0	12	9
pytest-full	24	18
pytorch2.1	6	5
pytorch_lightning	10	8
pytorch2.3	3	2
pytorch2.2	3	2
lightning_app	1	0

Additional details and impacted files

@@            Coverage Diff            @@
##           master   #19771     +/-   ##
=========================================
- Coverage      84%      59%    -25%     
=========================================
  Files         426      421      -5     
  Lines       35280    35185     -95     
=========================================
- Hits        29616    20775   -8841     
- Misses       5664    14410   +8746     

[V0XNIHILI]

@awaelchli could you have a look at this PR? It's been open and ready for a while now and it is quite a simple change. Let me know what you think!

[awaelchli]

Looks great @V0XNIHILI
Thanks for sending the fix.
I pushed minor changes (the test wasn't passing because you asserted the repr, but the repr would only apply to an instance anyway).