Merge branch 'duo-chat-slash-command-streaming' into 'master'

Stream Duo Chat slash commands responses

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/144267



Merged-by: Gosia Ksionek <mksionek@gitlab.com>
Approved-by: Gosia Ksionek <mksionek@gitlab.com>
Approved-by: Nicolas Dular <ndular@gitlab.com>
Reviewed-by: Nicolas Dular <ndular@gitlab.com>
Co-authored-by: Alejandro Rodríguez <alejandro@gitlab.com>