This is the squashed together change from
https://gitlab.com/gitlab-org/gitlab/merge_requests/19623
that had been reverted previously.

Based on the refactoring in
https://gitlab.com/gitlab-org/gitlab/merge_requests/21130

The method does not only prepare the relation (as the `prepare_relation`
suggests), but also triggers batch counting which in turn executes the
query as a side-effect.

This is being signal-boosted with renaming the method to `prepare!`.

We use it in places where we actually want both (preloading/batch
counting) to happen. In other places (projects API), we actually don't
want that and have the ability to split this into multiple steps now.

The idea here is to make it explicit that at this point we are handling
an array and not a relation anymore.

This separates the "relation builder" from the "batch counting" concern.

https://gitlab.com/gitlab-org/gitlab/issues/37919

Move wiki routing under /-/ scope

See merge request gitlab-org/gitlab!21185

Remove unnecessary regexp escaping

See merge request gitlab-org/gitlab!21017

Upgrade CI image to Go 1.12 (part 2)

See merge request gitlab-org/gitlab!21249

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

Merge branch '32898-remove-coupling-of-alldiscussions-in-the-issues-discussion-tab-counter' into 'master'

Remove coupling of allDiscussions in the issues discussion tab counter

See merge request gitlab-org/gitlab!20899

The tab counter for discussion relies on 2
variables: discussionTabCounter _and_ isLoading.
In order to effectively watch both of these
properties, an additional computed value has
been created, which is subsequently watched.

This removes the dependency of allDiscussions
from discussionTabCounter

delete board_service.js file

Closes #28616

See merge request gitlab-org/gitlab!20168

Remove hide_dismissed_vulnerabilities feature flag

See merge request gitlab-org/gitlab!20483

Add a unique constraint to `software_licenses.name` column

See merge request gitlab-org/gitlab!19840

* Remove duplicates
* Re-assign policies to oldest duplicate

Fetch initial merge request widget data async

Closes #31406

See merge request gitlab-org/gitlab!20719

Remove duplicate import from gfm_auto_complete_spec.js

See merge request gitlab-org/gitlab!21233

Resolve duplication `project-feature-toggle` buttons

Closes #33663

See merge request gitlab-org/gitlab!20278

Initial version of the partial button for
project feature toggles.

Make issuables list specs compatible w/ BootstrapVue 2

See merge request gitlab-org/gitlab!20991

Historical table for  gitlab_subscriptions table

See merge request gitlab-org/gitlab!19694

Resolve "Clean up Cohorts"

See merge request gitlab-org/gitlab!20779

The cohorts tables is receiving a facelift and the data
provided to the frontend will now exlclude the current
month.

Merge branch '29716-prometheus-server-fails-to-get-metrics-from-deployed-environments' into 'master'

Rake task to ensure metrics from deployed environments

Closes #29716

See merge request gitlab-org/gitlab!21007

Fix link in scss doc

See merge request gitlab-org/gitlab!21228

Add include to the list of unusable job names

See merge request gitlab-org/gitlab!21221

Reduce Gitaly calls in BuildHooksWorker

See merge request gitlab-org/gitlab!20365

`Ci::Build.execute_hooks` always made Gitaly calls regardless of whether
a project had any hooks or services. Now we lazily only perform these
calls only if there are active hooks or services.

This is similar to what we did for `PostReceive` in
https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/31741/diffs.

Relates to
https://gitlab.com/gitlab-com/gl-infra/infrastructure/issues/8407

Update puma to v4.3.1

See merge request gitlab-org/gitlab!21234