Resolve "Add REGISTRY_ONLY Sidecar template"
General MR
Summary
We will want to enable users to configure setting REGISTRY_ONLY traffic policy on a per-package basis, in addition to allowing for it to be set globally in the meshConfig (see #1886). Creating Sidecars in each package will also allow us to focus on individual packages as we define what whitelists will need to be created per application.
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Linked Issue
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Closes #29 (closed)