Test

Add documentation for the behaviors for aggregates (#2069) #951

Job	Run time
@dataplan/pg tests / build (12, 20.x)	3m 22s
PostGraphile mutation tests / build (12, 20.x)	3m 45s
PostGraphile mutation tests (exported as graphql-js) / build (12, 20.x)	8m 54s
PostGraphile mutation tests (exported as typeDefs) / build (12, 20.x)	7m 38s
PostGraphile polymorphic query tests / build (12, 20.x)	2m 52s
PostGraphile polymorphic query tests (exported as graphql-js) / build (12, 20.x)	7m 26s
PostGraphile polymorphic query tests (exported as typeDefs) / build (12, 20.x)	6m 4s
PostGraphile v4 queries tests / build (12, 20.x)	3m 36s
PostGraphile v4 queries tests (exported as graphql-js) / build (12, 20.x)	16m 21s
PostGraphile v4 queries tests (exported as typeDefs) / build (12, 20.x)	12m 17s
PostGraphile schema tests / build (12, 20.x)	5m 59s
Small package tests / build (12, 20.x)	2m 59s
	1h 21m 13s

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