Use singleton for GraphQL::Client
Clean up code by using a Singleton for GraphQL::Client
. This MR is necessary for making it easier to implement https://gitlab.com/gitlab-org/gitlab/-/issues/381133+.
Clean up code by using a Singleton for GraphQL::Client
. This MR is necessary for making it easier to implement https://gitlab.com/gitlab-org/gitlab/-/issues/381133+.