Edited baseline netowkring scenario

[yshafner]

Overview/Summary

Replaced baseline networking scenario to remove public internet access

This PR fixes/adds/changes/removes

1. changes diagram png and vhdx

Breaking Changes

1. Replace me
2. Replace me

Testing Evidence

Replace this with any testing evidence to show that your Pull Request works/fixes as described and planned (include screenshots, if appropriate).

As part of this Pull Request I have

• [x ] Read the Contribution Guide and ensured this PR is compliant with the guide
• [x ] Ensured the resource API versions in .bicep file/s I am adding/editing are using the latest API version possible
• [x ] Checked for duplicate Pull Requests
• [x ] Associated it with relevant GitHub Issues
• [ x] (AVD LZA Team Only) Associated it with relevant ADO Items
• [x ] Ensured my code/branch is up-to-date with the latest changes in the main branch
• [x ] Performed testing and provided evidence.
• [ x] Updated relevant and associated documentation (e.g. Contribution Guide, Module READMEs, Docs etc.)