tests/api/users: Flush fixtures before querying relationships
tests/api/users: Flush fixtures before querying relationships

Turbo87/skylines,skylines-project/skylines,Turbo87/skylines,Turbo87/skylines,skylines-project/skylines,Harry-R/skylines,skylines-project/skylines,RBE-Avionik/skylines,RBE-Avionik/skylines,RBE-Avionik/skylines,Harry-R/skylines,RBE-Avionik/skylines,Harry-R/skylines,Harry-R/skylines,skylines-project/skylines,Turbo87/skylines