Remove kl weight warning

[adamgayoso]

The kl weight warning is confusing to our users, as it's not clear what the user response should be. I would argue the response should not be more training just to reach the final kl weight, as something like this has never been benchmarked.

As a compromise I've set the kl weight to be logged by lightning.

[codecov]

Codecov Report

Base: 90.85% // Head: 90.83% // Decreases project coverage by -0.01% ⚠️

Coverage data is based on head (ddb54d9) compared to base (55048eb).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1773      +/-   ##
==========================================
- Coverage   90.85%   90.83%   -0.02%     
==========================================
  Files         118      118              
  Lines       10015     9999      -16     
==========================================
- Hits         9099     9083      -16     
  Misses        916      916              

Impacted Files	Coverage Δ
scvi/model/base/_training_mixin.py	93.75% <100.00%> (-3.31%)	⬇️
scvi/train/_trainingplans.py	93.73% <100.00%> (+0.03%)	⬆️

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