[ECR] [request]: Support for Wiz Repo for ECR Pull Through Cache

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**Tell us about your request**
Add support for ECr Pull through cache to pull from the Wiz secured images registry - registry.os.wiz.io

**Which service(s) is this request for?**
ECR

**Tell us about the problem you're trying to solve. What are you trying to do, and why is it hard?**
We would like all of our Developers to use secured / hardened images. Wiz provides these from their own registry - registry.os.wiz.io - which can be accessed with some credentials provided by Wiz.
We already use ECRs for our own custom images as well as the pull through cache for images that we currently pull from github or dockerhub and would like to be able to do the same for these Wiz images, this keeps things consistent and means we don't have to handle switching docker logins in our pipelines

**Are you currently working around this issue?**
no workaround, just pulling directly from Wiz with no ecr cache

Start by reviewing the ECR pull-through cache documentation and how credentials are configured for external registries. Confirm whether registry.os.wiz.io can be supported as an upstream and identify the required Wiz credentials and configuration. Done means developers can pull Wiz secured images through ECR without switching Docker logins in their pipelines.

Written by the indexing model from the issue text.