Portal Accelerator fix for VPN Gateway regional deployments

[Springstone]

Overview/Summary

Portal Accelerator fix for VPN Gateway regional deployments - removing the region check for regional deployments as all regions support this (as opposed to AZ deployments).

This PR fixes/adds/changes/removes

1. Updating Portal Accelerator

Breaking Changes

1. N/A

Testing Evidence

Testing URLs

Azure Public

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.
• [X] Updated relevant and associated documentation.
• [X] Updated the "What's New?" wiki page (located: /docs/wiki/whats-new.md)

[jtracey93]

Replaced by #1520