Private Service Connect now includes support for cross-region read replicas

## Feature Private Service Connect now includes support for [cross-region read replicas](https://cloud.google.com/sql/docs/mysql/replication/create-replica#create-read-replica-cloud-sql-instance-psc-enabled). You can also [choose an availability type](https://cloud.google.com/sql/docs/mysql/configure-ha) (REGIONAL or ZONAL) for Private Service Connect-enabled instances. Both features are in [GA](https://cloud.google.com/products?hl=en#product-launch-stages).