Fix accession event helper #1163

Job	Run time
Lint	1m 34s
Test frontend	43s
Test mcp-server on 3.8	9m 57s
Test mcp-server on 3.9	11m 14s
Test mcp-server on 3.10	12m 7s
Test mcp-client on 3.8	12m 54s
Test mcp-client on 3.9	10m 47s
Test mcp-client on 3.10	11m 20s
Test dashboard on 3.8	10m 19s
Test dashboard on 3.9	11m 11s
Test dashboard on 3.10	11m 21s
Test archivematica-common on 3.8	12m 21s
Test archivematica-common on 3.9	10m 11s
Test archivematica-common on 3.10	13m 16s
Test storage-service on 3.9	13m 25s
Test migrations on 3.9	12m 56s
	2h 45m 36s

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