(ui): postgres ha cluster - add support for cluster deployment with 1 server
Related MR: !826 (merged)
Currently, when choosing Number of instances: 1, we observe an error
Also, the check for "Nubmer of synchronous standbys" should not be active if the "Enable synchronous replication" option is not selected
Please add support for cluster deployment with 1 server.
Edited by Vitaliy Kukharik