Fix: update integration sandbox manifest generation #2175

Job	Run time
unit_specs-director (postgresql)	3m 27s
unit_specs (monitor:parallel)	54s
unit_specs-director (mysql)	5m 39s
unit_specs (release)	51s
unit_specs (common:parallel)	50s
unit_specs (nats_sync:parallel)	53s
	12m 34s

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