chore: print an error log when JSON-serializing fails

[azhou-determined]

Ticket

Description

Print an error log containing the object that failed to JSON-serialize. This method is used internally in enough places that an error log of the object should help debugging.

Test Plan

Checklist

• Changes have been manually QA'd
• User-facing API changes need the "User-facing API Change" label.
• Release notes should be added as a separate file under docs/release-notes/.
  See Release Note for details.
• Licenses should be included for new code which was copied and/or modified from any external code.

[netlify]

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[codecov]

Codecov Report

Attention: Patch coverage is 50.00000% with 3 lines in your changes are missing coverage. Please review.

Project coverage is 45.30%. Comparing base (4f180db) to head (508d4bf).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #9365      +/-   ##
==========================================
+ Coverage   45.28%   45.30%   +0.01%     
==========================================
  Files        1227     1227              
  Lines      154048   154053       +5     
  Branches     2404     2404              
==========================================
+ Hits        69766    69795      +29     
+ Misses      84090    84066      -24     
  Partials      192      192              

Flag	Coverage Δ
backend	41.80% <ø> (+0.05%)	⬆️
harness	64.07% <50.00%> (-0.01%)	⬇️
web	36.33% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Files	Coverage Δ
harness/determined/util.py	73.17% <50.00%> (-0.59%)	⬇️

... and 4 files with indirect coverage changes