refactor(graphql): `TestObject` marked as `Searchable`. #434

Job	Run time
Settings / Detect Packages	3s
Sync package: core	9s
Sync package: documentator	7s
Sync package: eloquent	11s
Sync package: formatter	9s
Sync package: graphql-printer	9s
Sync package: graphql	10s
Sync package: migrator	9s
Sync package: queue	8s
Sync package: serializer	6s
Sync package: spa	8s
Sync package: testing	9s
	1m 38s

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