Added tests for the go/vt/callinfo package

[VaibhavMalik4187]

Description

This commit increases the code coverage of the go/vt/callinfo package to >74%

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]

Review Checklist

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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 (d5b8fb1) 47.51%.
Report is 6 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #15059      +/-   ##
==========================================
+ Coverage   47.49%   47.51%   +0.01%     
==========================================
  Files        1149     1152       +3     
  Lines      239475   239539      +64     
==========================================
+ Hits       113730   113807      +77     
+ Misses     117138   117122      -16     
- Partials     8607     8610       +3     

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[VaibhavMalik4187]

@GuptaManan100 could you please go through this PR whenever you have some spare time? Thanks!

[GuptaManan100]

LGTM!

[VaibhavMalik4187]

LGTM!

Thanks for reviewing.