architecture: instance version is checked during joining the cluster

Picodata follow-up

• Follow-up for picodata!1424 (merged)
• See also picodata#976 (closed)
• Doc pages to change: https://docs.picodata.io/picodata/devel/architecture/topology_management/#joining

https://docs.picodata.io/picodata/devel/reference/audit_events/#join_instance (?)