tests: add tests for vitess/go/cmd/zk/internal/zkfilepath

[EshaanAgg]

Description

• Added tests for vitess/go/cmd/zk/internal/zkfilepath
• Refactored the original code for more readibility

Related Issue(s)

• Part of Improve Unit Test Coverage #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

Deployment Notes

[vitess-bot]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (b15e9f6) 47.27% compared to head (7d2e0ee) 47.27%.
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #14970   +/-   ##
=======================================
  Coverage   47.27%   47.27%           
=======================================
  Files        1138     1139    +1     
  Lines      238842   238878   +36     
=======================================
+ Hits       112907   112926   +19     
- Misses     117342   117355   +13     
- Partials     8593     8597    +4     

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[mattlord]

Thanks, @EshaanAgg ! Coverage for the package went from non-existent (0%) to 100%:

• main: https://app.codecov.io/gh/vitessio/vitess/tree/main/go%2Fcmd
• PR branch: https://app.codecov.io/gh/vitessio/vitess/pull/14970/tree/go/cmd/zk/internal

[ajm188]

This is great; thanks!