Ensure provider status is in provisioned state for Azure Express Route Circuit

Peering cannot be configured, if Azure Express Route Circuit not in provisioned state.

An Azure ExpressRoute Circuit provisioning state cannot be changed in the web console. It will reflect the state that the circuit is in based on your connectivity provider's state with connecting to the circuit. To learn more about how to provision an ExpressRoute Circuit, including what the provisioning states mean, see the Azure documentation (below).

In Terraform -

1. In the azurerm_express_route_circuit resource, set service_provider_provisioning_state to provisioned.
   Note: this must be based on what the connectivity provider shows as the current state.

References:
https://learn.microsoft.com/en-us/azure/expressroute/expressroute-howto-circuit-portal-resource-manager
https://learn.microsoft.com/en-us/azure/expressroute/expressroute-workflows#expressroute-circuit-provisioning-states
https://registry.terraform.io/providers/hashicorp/azurerm/latest/docs/resources/express_route_circuit