Plugin API for Shared Channels: support auto invite (#25834)

* option for auto inviting plugin to all shared channels.

* auto-invite remotes to shared channels when flag set

* fix unit test

---------

Co-authored-by: Mattermost Build <build@mattermost.com>

server/channels/store/sqlstore/remote_cluster_store.go

@@ -191,6 +191,10 @@ func (s sqlRemoteClusterStore) GetAll(filter model.RemoteClusterQueryFilter) ([]
 		query = query.Where(sq.Eq{"rc.PluginID": filter.PluginID})
 	}
 
+	if filter.RequireOptions != 0 {
+		query = query.Where(sq.NotEq{fmt.Sprintf("(rc.Options & %d)", filter.RequireOptions): 0})
+	}
+
 	if filter.Topic != "" {
 		trimmed := strings.TrimSpace(filter.Topic)
 		if trimmed == "" || trimmed == "*" {