Adding Multi-Region Network Deployment

[brsteph]

Overview/Summary

This PR adds the ability to a networking stack into two regions as part of the ALZ portal deployment.

This PR fixes/adds/changes/removes

1. Deploy multiple Hub virtual networks, and have them peered together
2. Associate single DDoS Network Protection instance to all hub networks deployed
3. Deploy Private DNS Zones for Azure PaaS services to multiple regions
4. Associate Private DNS Zones to all virtual networks
5. Deploy VPN Gateway to multiple regions
6. Deploy ExpressRoute Gateway to multiple regions
7. Deploy Azure Firewall to multiple regions
8. Deploy Azure Firewall policies to support multi-region
9. Deploy vWAN Virtual Hub to multiple regions, including embedded services
10. Deploy Identity virtual network in multiple regions

Breaking Changes

1. Unsure at this time - may need feedback on this.

Testing Evidence

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

(More can be provided as needed)

Testing URLs

The below URLs can be updated where the placeholders are, look for {YOUR GITHUB BRANCH NAME HERE - Remove Curly Brackets Also} & {YOUR GITHUB BRANCH NAME HERE - Remove Curly Brackets Also}, to allow you to test your portal deployment experience.

Please also replace the curly brackets on the placeholders {}

Azure Public

Azure US Gov (Fairfax)

As part of this Pull Request I have

• [X] Checked for duplicate Pull Requests
• [X] Associated it with relevant issues, for tracking and closure.
• [X] Ensured my code/branch is up-to-date with the latest changes in the main branch
• [X] Performed testing and provided evidence.
• [X] Ensured contribution guidance is followed.
• [ ] Updated relevant and associated documentation.
• [ ] Updated the "What's New?" wiki page (located: /docs/wiki/whats-new.md)