Enforce smoothing in [0, 1) in `TensorBoardMetric

[SebastianAment]

Summary: Checks the smoothing parameter in the constructor.

Differential Revision: D89211791

[meta-codesync]

@SebastianAment has exported this pull request. If you are a Meta employee, you can view the originating Diff in D89211791.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.53%. Comparing base (1f75852) to head (cb5c599).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #4661   +/-   ##
=======================================
  Coverage   96.53%   96.53%           
=======================================
  Files         567      567           
  Lines       59104    59114   +10     
=======================================
+ Hits        57054    57065   +11     
+ Misses       2050     2049    -1     

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[meta-codesync]

This pull request has been merged in 92e8311.