adding unit test for pkg/client/registry.go

[Prakhar-Shankar]

Title:

Add unit tests for client/registry.go

Description:

This PR adds unit tests for the pkg/client/registry.go file to improve coverage and ensure the correctness of the NewRegistry, GetGenericClient, and GetGenericClientWithName functions.

Fixes issue #266

Tests include:

Successful client initialization

Retrieval of default client

User-agent customization via GetGenericClientWithName

These tests help validate basic functionality and ensure expected behavior when the registry is used.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 31.30%. Comparing base (1ca95a5) to head (ab2e3d1).
⚠️ Report is 39 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #272      +/-   ##
==========================================
+ Coverage   27.65%   31.30%   +3.65%     
==========================================
  Files          94       96       +2     
  Lines       10450    11327     +877     
==========================================
+ Hits         2890     3546     +656     
- Misses       7358     7535     +177     
- Partials      202      246      +44     

Flag	Coverage Δ
unittests	31.30% <ø> (+3.65%)	⬆️

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[Prakhar-Shankar]

@chrisliu1995 can you please review this PR, thanks :)