Stop AuthorizedProjectsWorker double scheduling in Projects::CreateService

Queue: authorized_projects

When we add a project to a group, we refresh the permissions of members of the group to include this new project. Unfortunately, in EE, we do this twice:

1. https://gitlab.com/gitlab-org/gitlab/-/blob/v12.7.0-ee/app/services/projects/create_service.rb#L104-106 (non-blocking)
2. https://gitlab.com/gitlab-org/gitlab/-/blob/v12.7.0-ee/ee/app/services/ee/projects/create_service.rb#L52 (blocking)

This is wasteful and directly contributes to the queue size of this job. We should:

1. Do some git history spelunking to see why this is. (Per Chesterton's fence, we shouldn't just blindly remove the second call.)
2. Remove the second call if we can. (If we can't, we need to re-think more dramatically.)
3. Monitor the results. I estimated in #148 (comment 287652937) that this could save over 30% of the jobs we currently schedule in this queue.