fix: fall back to TLS trust when cluster CA path is missing

[adietish]

fixes eclipse-che/che#23878

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[codecov-commenter]

Codecov Report

❌ Patch coverage is 29.49389% with 404 lines in your changes missing coverage. Please review.
✅ Project coverage is 28.09%. Comparing base (71098f6) to head (c0a8be0).
⚠️ Report is 358 commits behind head on main.

Files with missing lines	Patch %	Lines
...evtools/gateway/auth/tls/DefaultTlsTrustManager.kt	14.14%	81 Missing and 4 partials ⚠️
...ools/gateway/view/steps/DevSpacesServerStepView.kt	0.00%	75 Missing ⚠️
...ools/gateway/auth/tls/ui/TLSTrustDecisionDialog.kt	0.00%	51 Missing ⚠️
...evtools/gateway/auth/code/OpenShiftAuthCodeFlow.kt	9.75%	36 Missing and 1 partial ⚠️
.../view/steps/auth/AbstractAuthenticationStrategy.kt	0.00%	30 Missing ⚠️
...vtools/gateway/auth/tls/ui/UITlsDecisionAdapter.kt	0.00%	23 Missing ⚠️
...ools/gateway/openshift/OpenShiftKubeConfigUtils.kt	56.25%	16 Missing and 5 partials ⚠️
...steps/auth/OpenShiftOAuthAuthenticationStrategy.kt	0.00%	19 Missing ⚠️
...devtools/gateway/auth/code/HttpClientExtensions.kt	36.00%	15 Missing and 1 partial ⚠️
...vtools/gateway/openshift/OpenShiftClientBuilder.kt	88.88%	5 Missing and 5 partials ⚠️
... and 14 more

Additional details and impacted files

@@            Coverage Diff             @@
##            main     #317       +/-   ##
==========================================
+ Coverage   0.00%   28.09%   +28.09%     
==========================================
  Files          4      106      +102     
  Lines         26     4350     +4324     
  Branches       0      799      +799     
==========================================
+ Hits           0     1222     +1222     
- Misses        26     2972     +2946     
- Partials       0      156      +156     

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