PHRAS-4088: improving Job ack in workerRunningJob #1052

Job	Run time
build phraseanet-setup / build	3m 35s
build phraseanet-fpm / build	3m 30s
build phraseanet-elasticsearch / build	40s
build phraseanet-db / build	23s
build phraseanet-worker / build	3m 39s
build phraseanet-nginx / build	2m 51s
unit test	5m 52s
	20m 30s

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