fix(k8s): handle Kubernetes kubeconfig content correctly

[prowler-bot]

Backport

This will backport the following commits from master to v4.6:

• fix(k8s): handle Kubernetes kubeconfig content correctly (#5939)

Questions ?

Please refer to the Backport tool documentation

[codecov]

Codecov Report

Attention: Patch coverage is 88.23529% with 2 lines in your changes missing coverage. Please review.

Project coverage is 89.91%. Comparing base (398fa37) to head (3d2fc30).
Report is 3 commits behind head on v4.6.

Files with missing lines	Patch %	Lines
...rowler/providers/kubernetes/kubernetes_provider.py	88.23%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             v4.6    #5967      +/-   ##
==========================================
- Coverage   89.94%   89.91%   -0.03%     
==========================================
  Files        1147     1147              
  Lines       35608    35617       +9     
==========================================
- Hits        32026    32025       -1     
- Misses       3582     3592      +10     

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