chore(k8s): remove kubernetes auth

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 37.90%. Comparing base (2ecef8d) to head (abba3f4).

Files	Patch %	Lines
cmd/plugin.go	0.00%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #88 +/- ## ========================================== + Coverage 35.54% 37.90% +2.36% ========================================== Files 7 7 Lines 332 306 -26 ========================================== - Hits 118 116 -2 + Misses 199 175 -24 Partials 15 15 ```

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