Revert "Merge branch '55127-add-delay-after-mr-creation-for-async-tasks-to-complete' into 'master'"

See merge request gitlab-org/gitlab-ce!28492

(cherry picked from commit a5f810c9)

c04ea583 Revert "Merge branch '55127-add-delay-after-mr-creation-for-async-tasks-to-complete' into 'master'"