live: Don't log unnecessary warnings.

[daavoo]

Only log warnings about Studio if studio_token is set. Only log warnings about DVC Repo if save_dvc_exp is True.

[codecov-commenter]

Codecov Report

Base: 97.09% // Head: 96.67% // Decreases project coverage by -0.41% ⚠️

Coverage data is based on head (7f2d2e5) compared to base (4bcae41).
Patch coverage: 75.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #406      +/-   ##
==========================================
- Coverage   97.09%   96.67%   -0.42%     
==========================================
  Files          37       37              
  Lines        2167     2167              
  Branches      203      180      -23     
==========================================
- Hits         2104     2095       -9     
- Misses         37       41       +4     
- Partials       26       31       +5     

Impacted Files	Coverage Δ
src/dvclive/dvc.py	89.89% <ø> (-1.28%)	⬇️
src/dvclive/live.py	93.80% <75.00%> (-3.06%)	⬇️
src/dvclive/studio.py	93.67% <0.00%> (-1.27%)	⬇️

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