PS-606 databox collection tree: fix children load #1016

Job	Run time
Build Databox Indexer / build	22s
Build Matomo PHP / build	22s
Build Keycloak / build	13s
Build Matomo NGINX / build	15s
Build nginx-cache-purge / build	21s
Build nginx-fpm-base / build	15s
Build nodejs-base / build	13s
Build php-fpm-base / build	12s
Build Report API / build	13s
Build Expose Client / build	13s
Build Dashboard / build	18s
Build Configurator / build	23s
Build Databox Client / build	2m 47s
Build Uploader Client / build	16s
Build Databox API / build	1m 55s
Build Notify API / build	45s
Build Uploader API / build	48s
Build Expose API / build	51s
Setup stack	6m 42s
	17m 24s

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