fix(router): return typename on Cosmo Streams mutations#2422

dkorittki merged 4 commits intomainwundergraph/cosmo:mainfrom

dominik/eng-8647-__typename-is-null-on-cosmo-streams-edfs-mutationswundergraph/cosmo:dominik/eng-8647-__typename-is-null-on-cosmo-streams-edfs-mutationsCopy head branch name to clipboard