Added unit test for hash.go in convert package

[sivasathyaseeelan]

Fix

This PR adds unit test for hash.go in convert package and partially fixes apache/skywalking#11942

• Add a unit test to verify that the fix works.
• Explain briefly why the bug exists and how to fix it.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 48.16%. Comparing base (fb543e7) to head (8d22ab9).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #393      +/-   ##
==========================================
+ Coverage   48.13%   48.16%   +0.03%     
==========================================
  Files         173      173              
  Lines       21500    21500              
==========================================
+ Hits        10348    10355       +7     
+ Misses      10285    10278       -7     
  Partials      867      867              

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