add core values file for testing helmRepos/oci

No package changes. Added tests/oci-values.yaml for pipeline job to run clean install with helmRepos instead of gitRepositories. Once pipeline-templates MR is merged, can test pipeline with label test-ci::oci

tests/oci-values.yaml

+helmRepositories:
+  - name: "registry1"
+    repository: "oci://registry1.dso.mil/bigbang"
+    existingSecret: "private-registry"
+    type: "oci"
+    username: ""
+    password: ""
+    email: ""
+
+istio:
+  sourceType: "helmRepo"
+
+istioOperator:
+  sourceType: "helmRepo"
+
+kiali:
+  sourceType: "helmRepo"
+
+kyverno:
+  sourceType: "helmRepo"
+
+kyvernoPolicies:
+  sourceType: "helmRepo"
+
+kyvernoReporter:
+  sourceType: "helmRepo"
+
+promtail:
+  sourceType: "helmRepo"
+
+loki:
+  sourceType: "helmRepo"
+
+neuvector:
+  sourceType: "helmRepo"
+
+tempo:
+  sourceType: "helmRepo"
+
+monitoring:
+  sourceType: "helmRepo"
+
+addons:
+  metricsServer:
+    sourceType: "helmRepo"
+
+  ### Loki dependency
+  minioOperator:
+    enabled: true
+
+    sourceType: "helmRepo"
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