[Task] Ensure support for single region Power Platform geographies

[mattdot]

Description

In a geography that is truly single-region (i.e. Sweden ... verify with current Microsoft documentation), a single VNet footprint would be sufficient;

Add conditional logic may be added in a future template update.

Definition of Done

- Conditional logic allows deploying only primary vnet resources in single-region geographies.

Values Provided

• Allow the template to deployed in more geographies/regions.
• Support for Sweden which tends to have AI models before others.