feat(k8s): rework kubeconfig handling

[jtherin]

No description provided.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 55.24862% with 162 lines in your changes missing coverage. Please review.

Project coverage is 70.89%. Comparing base (5bf53e0) to head (07ffbaa).
Report is 344 commits behind head on master.

Files with missing lines	Patch %	Lines
...nal/namespaces/k8s/v1/custom_kubeconfig_helpers.go	53.20%	56 Missing and 17 partials ⚠️
...nal/namespaces/k8s/v1/custom_kubeconfig_install.go	39.28%	47 Missing and 4 partials ⚠️
...nternal/namespaces/k8s/v1/custom_kubeconfig_get.go	70.73%	22 Missing and 2 partials ⚠️
...l/namespaces/k8s/v1/custom_kubeconfig_uninstall.go	60.86%	6 Missing and 3 partials ⚠️
internal/namespaces/k8s/v1/custom.go	78.57%	3 Missing ⚠️
...ternal/namespaces/k8s/v1/custom_execcredentials.go	33.33%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4137      +/-   ##
==========================================
- Coverage   75.45%   70.89%   -4.57%     
==========================================
  Files         202      294      +92     
  Lines       44323    66263   +21940     
==========================================
+ Hits        33444    46975   +13531     
- Misses       9653    17625    +7972     
- Partials     1226     1663     +437     

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[remyleone]

Why is this code commented?

[jtherin]

to avoid possible leaking of a token