local_scheduler: ignore bad utf-8 data instead of crashing

[d4l3k]

Fixes #715

This sets an error handler so any invalid UTF-8 characters are replaced with the unknown character symbol instead of logs failing. https://docs.python.org/3/library/codecs.html#error-handlers

Test plan:

pytest torchx/schedulers/test/local_scheduler_test.py -k invalid_utf8

[kiukchung]

lgtm

[codecov]

Codecov Report

Merging #718 (47868b8) into main (cc6b386) will decrease coverage by 0.05%.
The diff coverage is 75.00%.

@@            Coverage Diff             @@
##             main     #718      +/-   ##
==========================================
- Coverage   93.02%   92.98%   -0.05%     
==========================================
  Files          91       91              
  Lines        5997     6000       +3     
==========================================
  Hits         5579     5579              
- Misses        418      421       +3     

Impacted Files	Coverage Δ
torchx/schedulers/local_scheduler.py	93.12% <75.00%> (ø)

... and 2 files with indirect coverage changes

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