Merge branch '429416-edit-organization-form-swap-mock-graphql-mutation-for-real-mutation' into 'master' 

Swap organizationUpdate mock mutation for real one

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/139169



Merged-by: Frédéric Caplette <fcaplette@gitlab.com>
Approved-by: Eduardo Bonet <ebonet@gitlab.com>
Approved-by: Frédéric Caplette <fcaplette@gitlab.com>
Co-authored-by: Peter Hegman <phegman@gitlab.com>