BREAKING(log): remove NOTSET LogLevel

[timreichen]

Changes
This PR removes the NOTSET LogLevel.

Reasoning
Instead of NOTSET loggers should be initialized with the default set LogLevel (which is INFO).

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.49%. Comparing base (69858cf) to head (a5f506a).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6078      +/-   ##
==========================================
- Coverage   96.49%   96.49%   -0.01%     
==========================================
  Files         535      535              
  Lines       41281    41280       -1     
  Branches     6163     6163              
==========================================
- Hits        39833    39832       -1     
  Misses       1404     1404              
  Partials       44       44              

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[kt3k]

There seem some dependencies to this symbol. https://github.com/search?q=NOTSET+language%3ATypeScript+std%2Flog&type=code

I don't find much value to this change, while it has some negative effects to the above users.