fix(TaskProcessing): Catch JSON encode errors in Manager#setTaskResult #7995

Job	Run time
changes	8s
integration-sqlite (capabilities_features, 8.2, main)	5m 14s
integration-sqlite (collaboration_features, 8.2, main)	6m 50s
integration-sqlite (comments_features, 8.2, main)	6m 37s
integration-sqlite (dav_features, 8.2, main)	10m 1s
integration-sqlite (features, 8.2, main)	11m 16s
integration-sqlite (federation_features, 8.2, main)	2m 26s
integration-sqlite (--tags ~@large files_features, 8.2, main)	12m 19s
integration-sqlite (filesdrop_features, 8.2, main)	4m 43s
integration-sqlite (openldap_features, 8.2, main)	4m 36s
integration-sqlite (openldap_numerical_features, 8.2, main)	5m 0s
integration-sqlite (ldap_features, 8.2, main)	5m 15s
integration-sqlite (remoteapi_features, 8.2, main)	4m 30s
integration-sqlite (setup_features, 8.2, main)	4m 33s
integration-sqlite (sharees_features, 8.2, main)	7m 7s
integration-sqlite (sharing_features, 8.2, main)	16m 6s
integration-sqlite (videoverification_features, 8.2, main)	8m 19s
integration-sqlite-summary	4s
	1h 55m 4s

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