feat(kubernetes): Handle empty `--kubeconfig-file`

[pedrooot]

Context

When running Prowler in Kubernetes, --kubeconfig-file is needed.

Description

Sets the --kubeconfig-file to its default route if it's not set

License

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[sergargar]

Good idea @pedrooot , but for in-cluster executions, the kubeconfig file is not needed.

[github-actions[bot]]

You can check the documentation for this PR here -> SaaS Documentation

[github-actions[bot]]

You can check the documentation for this PR here -> SaaS Documentation

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 10.00000% with 9 lines in your changes are missing coverage. Please review.

Project coverage is 86.51%. Comparing base (45ccd7e) to head (7bce4eb). Report is 10 commits behind head on master.

Files	Patch %	Lines
...rowler/providers/kubernetes/kubernetes_provider.py	10.00%	9 Missing :warning:

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #3980   +/-   ##
=======================================
  Coverage   86.51%   86.51%           
=======================================
  Files         768      768           
  Lines       23899    23901    +2     
=======================================
+ Hits        20677    20679    +2     
  Misses       3222     3222           

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