Resolve "Egress Whitelist - Promtail"

General MR

Summary

As part of big-bang&160, 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).

Relevant logs/screenshots

Package working in BigBang with test values. BigBang MR BB merge request: big-bang/bigbang!3985 (closed)

Linked Issue

[issue]#38 (closed)

Upgrade Notices

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For #38 (closed)