Merge branch '138-reeval-test-values' into 'main'

SKIP UPDATE CHECK Remove superfluous test values

Closes #138

See merge request !181

tests/test-values.yml

-istio:
-  enabled: false
 createNamespace: false
 imagePullSecrets:
-- private-registry
+  - private-registry
 networkPolicies:
   enabled: true
   controlPlaneCidr: 172.16.0.0/12