MM-62751: [Shared Channels] Allow remote users to be discoverable in the create DM/GM modal (#30918)

server/public/model/config.go

@@ -3459,6 +3459,8 @@ type ConnectedWorkspacesSettings struct {
 	EnableSharedChannels            *bool
 	EnableRemoteClusterService      *bool
 	DisableSharedChannelsStatusSync *bool
+	SyncUsersOnConnectionOpen       *bool
+	GlobalUserSyncBatchSize         *int
 	MaxPostsPerSync                 *int
 }
 
@@ -3483,6 +3485,14 @@ func (c *ConnectedWorkspacesSettings) SetDefaults(isUpdate bool, e ExperimentalS
 		c.DisableSharedChannelsStatusSync = NewPointer(false)
 	}
 
+	if c.SyncUsersOnConnectionOpen == nil {
+		c.SyncUsersOnConnectionOpen = NewPointer(false)
+	}
+
+	if c.GlobalUserSyncBatchSize == nil {
+		c.GlobalUserSyncBatchSize = NewPointer(25) // Default to MaxUsersPerSync
+	}
+
 	if c.MaxPostsPerSync == nil {
 		c.MaxPostsPerSync = NewPointer(ConnectedWorkspacesSettingsDefaultMaxPostsPerSync)
 	}