refactor: Add void return type to PHPUnit test methods #11183

Job	Run time
changes	8s
integration-sqlite (capabilities_features, 8.1, main)	1m 56s
integration-sqlite (collaboration_features, 8.1, main)	3m 46s
integration-sqlite (comments_features, 8.1, main)	1m 11s
integration-sqlite (dav_features, 8.1, main)	7m 30s
integration-sqlite (features, 8.1, main)	8m 17s
integration-sqlite (federation_features, 8.1, main)	3m 52s
integration-sqlite (--tags ~@large files_features, 8.1, main)	13m 13s
integration-sqlite (filesdrop_features, 8.1, main)	1m 48s
integration-sqlite (openldap_features, 8.1, main)	2m 8s
integration-sqlite (openldap_numerical_features, 8.1, main)	1m 5s
integration-sqlite (ldap_features, 8.1, main)	2m 30s
integration-sqlite (remoteapi_features, 8.1, main)	1m 37s
integration-sqlite (setup_features, 8.1, main)	1m 47s
integration-sqlite (sharees_features, 8.1, main)	5m 10s
integration-sqlite (sharing_features, 8.1, main)	16m 25s
integration-sqlite (videoverification_features, 8.1, main)	3m 7s
integration-sqlite-summary	4s
	1h 15m 34s

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