feat(k8s): rework kubeconfig handling

[jtherin]

No description provided.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 57.28155% with 132 lines in your changes missing coverage. Please review.

Project coverage is 72.37%. Comparing base (5bf53e0) to head (d4ab902).
Report is 264 commits behind head on master.

Files with missing lines	Patch %	Lines
...nal/namespaces/k8s/v1/custom_kubeconfig_helpers.go	56.91%	36 Missing and 17 partials ⚠️
...nal/namespaces/k8s/v1/custom_kubeconfig_install.go	40.00%	44 Missing and 4 partials ⚠️
...nternal/namespaces/k8s/v1/custom_kubeconfig_get.go	71.42%	18 Missing and 2 partials ⚠️
...l/namespaces/k8s/v1/custom_kubeconfig_uninstall.go	70.00%	3 Missing and 3 partials ⚠️
internal/namespaces/k8s/v1/custom.go	76.92%	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%   72.37%   -3.08%     
==========================================
  Files         202      289      +87     
  Lines       44323    54322    +9999     
==========================================
+ Hits        33444    39316    +5872     
- Misses       9653    13377    +3724     
- Partials     1226     1629     +403     

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