Fix error in duplicate PREMIS event ID handling #1770

Job	Run time
Test mcp-server on 3.8	6m 16s
Test frontend	29s
Lint	1m 7s
Test mcp-server on 3.9	6m 23s
Test mcp-server on 3.10	6m 51s
Test mcp-server on 3.11	7m 30s
Test mcp-server on 3.12	7m 34s
Test mcp-client on 3.8	6m 10s
Test mcp-client on 3.9	5m 43s
Test mcp-client on 3.10	6m 13s
Test mcp-client on 3.11	6m 16s
Test mcp-client on 3.12	8m 32s
Test dashboard on 3.8	7m 57s
Test dashboard on 3.9	6m 21s
Test dashboard on 3.10	6m 28s
Test dashboard on 3.11	6m 49s
Test dashboard on 3.12	9m 3s
Test archivematica-common on 3.8	6m 23s
Test archivematica-common on 3.9	7m 22s
Test archivematica-common on 3.10	5m 54s
Test archivematica-common on 3.11	5m 52s
Test archivematica-common on 3.12	6m 29s
Test storage-service on 3.9	5m 57s
Test migrations on 3.9	6m 56s
	2h 30m 35s

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