Added missing tests for the go/jsonutils package

[VaibhavMalik4187]

Description

This commit increases the code coverage of the go/jsonutil package to 100%.

Related Issue(s)

#14931

Checklist

• "Backport to:" labels have been added if this change should be back-ported to release branches
• If this change is to be back-ported to previous releases, a justification is included in the PR description
• Tests were added or are not required
• Did the new or modified tests pass consistently locally and on CI?
• Documentation was added or is not required

[vitess-bot]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (f751c83) 47.49% compared to head (e81696e) 47.50%.
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #15055   +/-   ##
=======================================
  Coverage   47.49%   47.50%           
=======================================
  Files        1149     1149           
  Lines      239475   239475           
=======================================
+ Hits       113730   113753   +23     
+ Misses     117138   117121   -17     
+ Partials     8607     8601    -6     

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[GuptaManan100]

LGTM!

[GuptaManan100]

The changes in this PR don't seem to be required.