feat: allow to save cluster + token to kubeconf (#23649)

[adietish]

fixes eclipse-che/che#23649

[codecov-commenter]

Codecov Report

❌ Patch coverage is 66.29213% with 120 lines in your changes missing coverage. Please review.
✅ Project coverage is 26.72%. Comparing base (71098f6) to head (db2b84c).
⚠️ Report is 268 commits behind head on main.

Files with missing lines	Patch %	Lines
...ools/gateway/view/steps/DevSpacesServerStepView.kt	0.00%	39 Missing ⚠️
...t/devtools/gateway/kubeconfig/KubeConfigEntries.kt	69.15%	18 Missing and 15 partials ⚠️
...hat/devtools/gateway/kubeconfig/KubeConfigUtils.kt	76.53%	11 Missing and 12 partials ⚠️
...at/devtools/gateway/kubeconfig/KubeConfigUpdate.kt	79.03%	6 Missing and 7 partials ⚠️
.../redhat/devtools/gateway/kubeconfig/FileWatcher.kt	22.22%	7 Missing ⚠️
...n/com/redhat/devtools/gateway/openshift/Cluster.kt	75.00%	1 Missing and 2 partials ⚠️
...vtools/gateway/openshift/OpenShiftClientFactory.kt	0.00%	1 Missing ⚠️
...lin/com/redhat/devtools/gateway/openshift/Utils.kt	91.66%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##            main     #223       +/-   ##
==========================================
+ Coverage   0.00%   26.72%   +26.72%     
==========================================
  Files          4       38       +34     
  Lines         26     1860     +1834     
  Branches       0      380      +380     
==========================================
+ Hits           0      497      +497     
- Misses        26     1301     +1275     
- Partials       0       62       +62     

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