Schema sync does not properly count and list multi-label nodes

[kmcginnes]

The schema sync process does not properly count nodes that have multiple labels or types. It will also not list out all node labels.

I originally saw this issue in openCypher connection, but it most likely exists for all connections.

Potential cause

• The schema sync count uses the first label instead of all labels
• The schema sync attribute discovery only creates a vertex config for the first label

Related issues

• Fix multi label/class support in neighbor counts #1194
• Multi-label support handles neighbor counts incorrectly #746