[BUG] "ApplicationGatewayRequestRoutingRulePriorityCannotBeEmpty" Errors in Gateway Deployment

During a greenfield Azure OSDU deployment from the master branch dated 1/27/2023, the "ApplicationGatewayRequestRoutingRulePriorityCannotBeEmpty" errors were observed in the Service Resources deployment step about Gateway resources, both appgw and istiogw. Further investigation shows, due to the azurerm version upgrade, routing rule priority is a required parameter now for gateway resources. Adding them to the terraform config files manually fixed the errors.