Fix error in duplicate PREMIS event ID handling #1769

Job	Run time
Test frontend	30s
Test mcp-server on 3.8	6m 22s
Lint	1m 9s
Test mcp-server on 3.9	5m 51s
Test mcp-server on 3.10	6m 50s
Test mcp-server on 3.11	6m 51s
Test mcp-server on 3.12	9m 10s
Test mcp-client on 3.8	6m 29s
Test mcp-client on 3.9	6m 43s
Test mcp-client on 3.10	5m 49s
Test mcp-client on 3.11	6m 21s
Test mcp-client on 3.12	6m 48s
Test dashboard on 3.8	6m 37s
Test dashboard on 3.9	6m 40s
Test dashboard on 3.10	6m 44s
Test dashboard on 3.11	6m 56s
Test dashboard on 3.12	8m 28s
Test archivematica-common on 3.8	5m 48s
Test archivematica-common on 3.9	6m 38s
Test archivematica-common on 3.10	5m 42s
Test archivematica-common on 3.11	5m 54s
Test archivematica-common on 3.12	8m 6s
Test storage-service on 3.9	6m 19s
Test migrations on 3.9	5m 38s
	2h 28m 23s

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