[RULE] Check that additional fleet locations are within allow regions

[BernieWhite]

Existing rule

No response

Suggested rule

Any configured additional locations of fleet resources should be within allowed locations if configured.

Pillar

Security

Additional context

This is similar to the existing rule Azure.EntraDS.ReplicaLocation.

References:

• https://learn.microsoft.com/en-us/azure/azure-compute-fleet/quickstart-create-rest-api?tabs=powershell-1
• https://learn.microsoft.com/en-us/azure/templates/microsoft.azurefleet/fleets