Update chart/values.yaml

Package Merge Request

Package Changes

Adds OSCAL component for Istio and Istio Operator

Package MR

https://repo1.dso.mil/platform-one/big-bang/apps/core/istio-controlplane/-/merge_requests/89

https://repo1.dso.mil/platform-one/big-bang/apps/core/istio-operator/-/merge_requests/36

For Issue

Closes #991 (closed) Closes #945 (closed)

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