fix: compute completed-item retention server-side #1134

Job	Run time
Build (ws-carrier/amd64)	1m 44s
Build (ws-carrier/arm64)	1m 12s
Build (windshift/arm64)	9m 1s
Build (windshift-runner/amd64)	2m 37s
Build (windshift-runner/arm64)	2m 16s
Build (windshift/amd64)	5m 55s
Merge Manifests (ws-carrier)	37s
Merge Manifests (windshift)	1m 23s
Merge Manifests (windshift-runner)	48s
	25m 33s

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