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Replace owned null returns with explicit outcomes #245

Job	Run time
Plan test shards	8s
Build	9m 21s
Analyzers and process recovery	11m 27s
Units U2	23m 45s
Units U3	18m 41s
Units U4	19m 11s
Aspire topology I01	32m 17s
Aspire topology I06	33m 23s
Aspire topology I05	45m 8s
Aspire topology I04	24m 36s
Aspire topology I10	41m 11s
Aspire topology I12	36m 22s
Aspire topology I09	33m 33s
Aspire topology I07	38m 2s
Aspire topology I02	21m 14s
Aspire topology I11	50m 19s
Aspire topology I03	23m 29s
Aspire topology I08	32m 17s
Units U1	13m 56s
Verify test partition	21s
	8h 28m 41s