Add test coverage for Manifest, ORM, and Service #142

Job	Run time
ci / Generate matrix	13s
ci / Context	2s
ci / 8.1 prf-low mysql57 phpunit all	2m 4s
ci / 8.2 mariadb phpunit all	2m 13s
ci / 8.3 mysql80 phpunit all	2m 23s
ci / 8.1 mysql57 phplinting	2m 3s
ci / 8.3 mysql84 phpunit all	2m 13s
ci / Check governance	0s
ci / Dispatch tag patch release	0s
	11m 11s

Provide feedback