fix(router): flush errors on sse streams#2377

dkorittki merged 14 commits intomainwundergraph/cosmo:mainfrom

dominik/eng-8451-no-errors-response-when-hook-returns-errors-on-sse-streamswundergraph/cosmo:dominik/eng-8451-no-errors-response-when-hook-returns-errors-on-sse-streamsCopy head branch name to clipboard