Vithumma/fix kubelogin bug

[vineeth-thumma]

Fix bug - > PoP token support crashes with nil pointer in cache.Replace when running non-root

#734

[codecov-commenter]

Codecov Report

❌ Patch coverage is 66.66667% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 57.39%. Comparing base (15edb67) to head (b600451).
⚠️ Report is 70 commits behind head on main.

Files with missing lines	Patch %	Lines
pkg/internal/token/execCredentialPlugin.go	33.33%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #735      +/-   ##
==========================================
- Coverage   63.43%   57.39%   -6.05%     
==========================================
  Files          37       47      +10     
  Lines        2210     2448     +238     
==========================================
+ Hits         1402     1405       +3     
- Misses        733      879     +146     
- Partials       75      164      +89     

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