Merge branch 'feature/precalculate-authorized-projects' into 'master'

Precalculate authorized projects in database

## What does this MR do?
It caches user's authorized projects in database instead of using multiple unions, which should simplify and speed-up things since this operation (getting authorized projects) is used a lot.

## Are there points in the code the reviewer needs to double check?
Did we miss a scenario where we need to refresh the list of projects?

## Does this MR meet the acceptance criteria?

- [x] [CHANGELOG](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CHANGELOG) entry added
- [ ] ~~[Documentation created/updated](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/doc/development/doc_styleguide.md)~~
- [ ] ~~API support added~~
- Tests
  - [x] Added for this feature/bug
  - [x] All builds are passing
- [x] Conform by the [merge request performance guides](http://docs.gitlab.com/ce/development/merge_request_performance_guidelines.html)
- [x] Conform by the [style guides](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CONTRIBUTING.md#style-guides)
- [x] Branch has no merge conflicts with `master` (if it does - rebase it please)
- [x] [Squashed related commits together](https://git-scm.com/book/en/Git-Tools-Rewriting-History#Squashing-Commits)

## What are the relevant issue numbers?
#23150 

See merge request !6839

1 files changed, 15 insertions, 0 deletions

diff --git a/app/workers/authorized_projects_worker.rb b/app/workers/authorized_projects_worker.rb
new file mode 100644
index 00000000000..331727ba9d8
--- /dev/null
+++ b/app/workers/authorized_projects_worker.rb
@@ -0,0 +1,15 @@
+class AuthorizedProjectsWorker
+  include Sidekiq::Worker
+  include DedicatedSidekiqQueue
+
+  def self.bulk_perform_async(args_list)
+    Sidekiq::Client.push_bulk('class' => self, 'args' => args_list)
+  end
+
+  def perform(user_id)
+    user = User.find_by(id: user_id)
+    return unless user
+
+    user.refresh_authorized_projects
+  end
+end