Merge branch 'backport-of-rd-3429-enabling-maximum-file-size-limit-in-repository-causes-pushes-to-fail' into 'master'

Backport of EE !4989

See merge request gitlab-org/gitlab-ce!18238

Optimise rendering of Markdown documents that belong to different projects

See merge request gitlab-org/gitlab-ce!18157

Update Auto-Devops docs to mention new REPLICAS env var

See merge request gitlab-org/gitlab-ce!18036

Fix empty state for build that does not have a trace

Closes #45204

See merge request gitlab-org/gitlab-ce!18278

Resolve "RSpec Flaky pruner failure / Job Failed #62392094"

Closes #45245

See merge request gitlab-org/gitlab-ce!18316

Signed-off-by: Rémy Coutable <remy@rymai.me>

Fix finding wiki file when Gitaly is enabled

Closes gitaly#1126

See merge request gitlab-org/gitlab-ce!18317

[CE Backport] Propagate broadcast messages to secondaries

See merge request gitlab-org/gitlab-ce!18324

Limit dropdown toggle width for protected branches / tags

See merge request gitlab-org/gitlab-ce!18212

Document example for sprintf without escaping

See merge request gitlab-org/gitlab-ce!16712

Add i18n and update specs for UnresolvedDiscussions vue component

See merge request gitlab-org/gitlab-ce!17866

Vertical misalignment of login box header

Closes #41748

See merge request gitlab-org/gitlab-ce!16275

Add possibility to filter Karma spec files by path

Closes #40899

See merge request gitlab-org/gitlab-ce!16102

Move TimeTrackingEstimateOnlyPane vue component

See merge request gitlab-org/gitlab-ce!18318

[Rails5] Update Event#subclass_from_attributes method

See merge request gitlab-org/gitlab-ce!18312

Link Monitor docs to the front page

Closes #45006

See merge request gitlab-org/gitlab-ce!18314

Fixes gitaly#1126

Resolve "tree/master shows incorrect CI build status"

Closes #44541

See merge request gitlab-org/gitlab-ce!17995

Replace vue resource with axios for pipeline details page

See merge request gitlab-org/gitlab-ce!18285

Client implementation for InfoAttributes

See merge request gitlab-org/gitlab-ce!18261

Resolve "Illustration for the case where the job has finished and the log was erased"

Closes #45159

See merge request gitlab-org/gitlab-ce!18253

Clients can now request the attributes from `$GIT_DIR/info/attributes`
through Gitaly. The Gitaly migration is described in gitlab-org/gitaly#1082.

The parser algorithm was implemented in a way it could handle both file
contents or a File handle, and both were already tested.

Other than that, using the boy scout rule, I've removed a class,
InfoAttributes, as it was delegating everything to the parser and
therefor wasn't really needed in my opinion.

This refactors the Markdown pipeline so it supports the rendering of
multiple documents that may belong to different projects. An example of
where this happens is when displaying the event feed of a group. In this
case we retrieve events for all projects in the group. Previously we
would group events per project and render these chunks separately, but
this would result in many SQL queries being executed. By extending the
Markdown pipeline to support this out of the box we can drastically
reduce the number of SQL queries.

To achieve this we introduce a new object to the pipeline:
Banzai::RenderContext. This object simply wraps two other objects: an
optional Project instance, and an optional User instance. On its own
this wouldn't be very helpful, but a RenderContext can also be used to
associate HTML documents with specific Project instances. This work is
done in Banzai::ObjectRenderer and allows us to reuse as many queries
(and results) as possible.

Resolve "Clean outdated flaky specs from the flaky specs report"

Closes #37721

See merge request gitlab-org/gitlab-ce!18196

Replace the `project/issues/milestones.feature` spinach test with an rspec analog

See merge request gitlab-org/gitlab-ce!18300

Replace the `project/commits/branches.feature` spinach test with an rspec analog

See merge request gitlab-org/gitlab-ce!18302

Resolve "When editing a comment in an issue, the preview mode is toggled in the main textarea"

Closes #44697

See merge request gitlab-org/gitlab-ce!18303

In Rails 5.0 the `ActiveRecord::Inheritance::subclass_from_attributes`
method was updated.
Now it calls the `find_sti_class` method [1] which is overriden in the `Event`
model and returns needed class (`Event` vs `PushEvent`).

[1]: https://github.com/rails/rails/blob/5-0-stable/activerecord/lib/active_record/inheritance.rb#L209

This commit fixes the errors like
```
143) User#contributed_projects doesn't include IDs for unrelated projects
      Failure/Error: action = attrs.with_indifferent_access[inheritance_column].to_i

      NoMethodError:
        undefined method `with_indifferent_access' for nil:NilClass
      # ./app/models/event.rb:118:in `subclass_from_attributes'
```
which are raised on the `RAILS5=1 rspec ...` command.