refactor: try catch a more specific exception during log_metrics.

[GdoongMathew]

What does this PR do?

Handle a more specific exception class during TensorBoardLogger.log_metrics, and remove its todo.

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📚 Documentation preview 📚: https://pytorch-lightning--21271.org.readthedocs.build/en/21271/

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 87%. Comparing base (c05cadb) to head (6d03f4a).

Additional details and impacted files

@@           Coverage Diff           @@
##           master   #21271   +/-   ##
=======================================
  Coverage      87%      87%           
=======================================
  Files         270      270           
  Lines       24078    24078           
=======================================
+ Hits        20866    20871    +5     
+ Misses       3212     3207    -5     

[GdoongMathew]

bump~