By actually checking if it deletes the correct Geo Event Log events.

The following is not supported:

```ruby
allow_any_instance_of(Geo::NodeStatusService).to receive(:call) { build(:geo_node_status, :healthy, cursor_last_event_id: 3) }
allow_any_instance_of(Geo::NodeStatusService).to receive(:call) { build(:geo_node_status, :healthy, cursor_last_event_id: 10) }
```

So instead, mock `Geo::NodeStatusService.new` and make it return a
`double` that can be used to mock all the things.

When there are no secondary nodes configured, there is no need to
generate Geo Log Events because no one will handle them.

This worker runs regularly to check all secondary nodes what there
last handled Geo Log event was. All the Geo Log events that are
handled by all nodes are pruned from the database. If the primary
failed to get the status of one of the nodes, nothing is done.

Closes gitlab-org/gitlab-ee#3577.

Add project actions in Audit events

Closes #1371

See merge request gitlab-org/gitlab-ee!3160

Remove Private Tokens

See merge request gitlab-org/gitlab-ee!3252

Applyed Patch for CI/CD Icons

See merge request gitlab-org/gitlab-ee!3255

Resolve "Failed to rebase MR from forked repo"

Closes #3900

See merge request gitlab-org/gitlab-ee!3258

Suppress MergeableSelector warning candidates in EE-only files

Closes #3879

See merge request gitlab-org/gitlab-ee!3225

IssueBoards: Show project name in group context inside board item and sidebar.

Closes #3239

See merge request gitlab-org/gitlab-ee!3242

Refactor responsive table styles to support nested error block -- EE merge edition

See merge request gitlab-org/gitlab-ee!3251

Show epic view

Closes #3550 and #3693

See merge request gitlab-org/gitlab-ee!3126

Pg ha updates docs

Closes omnibus-gitlab#2901, omnibus-gitlab#2899, omnibus-gitlab#2902, and omnibus-gitlab#2903

See merge request gitlab-org/gitlab-ee!3226

[EE] Refactor controller calls into services

Closes #3544

See merge request gitlab-org/gitlab-ee!3029

CE upstream: Thursday

Closes gitaly#689 et gitlab-ce#39513

See merge request gitlab-org/gitlab-ee!3250