Extend test coverage of the validate_file script #1752

Job	Run time
Test frontend	40s
Lint	1m 11s
Test mcp-server on 3.8	5m 55s
Test mcp-server on 3.9	5m 49s
Test mcp-server on 3.10	8m 27s
Test mcp-server on 3.11	9m 13s
Test mcp-server on 3.12	10m 10s
Test mcp-client on 3.8	8m 13s
Test mcp-client on 3.9	8m 40s
Test mcp-client on 3.10	9m 33s
Test mcp-client on 3.11	8m 40s
Test mcp-client on 3.12	10m 14s
Test dashboard on 3.8	9m 9s
Test dashboard on 3.9	9m 48s
Test dashboard on 3.10	10m 13s
Test dashboard on 3.11	9m 42s
Test dashboard on 3.12	10m 35s
Test archivematica-common on 3.8	8m 12s
Test archivematica-common on 3.9	8m 15s
Test archivematica-common on 3.10	8m 23s
Test archivematica-common on 3.11	9m 16s
Test archivematica-common on 3.12	10m 0s
Test storage-service on 3.9	6m 5s
Test migrations on 3.9	5m 46s
	3h 12m 9s

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