CE Backport: Prefer usage of helper `expanded_by_default?`

See merge request gitlab-org/gitlab-ce!27729

Stop using `Rails.env.test?` in views.

CE: Fixes EE differences for app/views/projects/new.html.haml

See merge request gitlab-org/gitlab-ce!27617

Use keyword args for databuilder push

See merge request gitlab-org/gitlab-ce!24088

Internationalisation of groups directory

See merge request gitlab-org/gitlab-ce!27679

This is one of many MRs opened in order to improve the overall
internationalisation of the GitLab codebase.

i18n documentation
https://docs.gitlab.com/ee/development/i18n/externalization.html

Fix slow performance with compiling HAML templates

Closes gitlab-ee#11198

See merge request gitlab-org/gitlab-ce!27782

Disallow read user scope to read project events

See merge request gitlab/gitlabhq!3067

In Rails 5, including `ActionView::Context` can have a significant and
hidden performance penalty because this module also includes
`ActionView::CompiledTemplates`. This means that any module that
includes ActionView::Context becomes a descendant of
`CompiledTemplates`.

When a partial is rendered for the first time, it runs
`ActionView::CompiledTemplates#module_eval`, which will evaluate a
string that defines a new method for that partial. For example, the
source of partial might be this string:

```
def _app_views_project_show_html_haml___12345(local_assigns, output)
  "hello world"
end
```

When this string is evaluated, the Ruby interpreter will define the
method and clear the global method cache for all descendants of
`ActionView::CompiledTemplates`. Previous to this change, we
inadvertently made a number of modules fall into this category:

* GroupChildEntity
* NoteUserEntity
* Notify
* MergeRequestUserEntity
* AnalyticsCommitEntity
* CommitEntity
* UserEntity
* Kaminari::Helpers::Paginator
* CurrentUserEntity
* ActionView::Base
* ActionDispatch::DebugExceptions::DebugView
* MarkupHelper
* MergeRequestPresenter

After this change:

* Kaminari::Helpers::Paginator
* ActionView::Base
* ActionDispatch::DebugExceptions::DebugView

Each time a partial is rendered for the first time, all methods for
those modules will have to be redefined. This can exact a significant
performance penalty.

How bad is this penalty? Using the following benchmark script, we can
use DTrace to sample the Ruby interpreter:

```
Benchmark.bm do |x|
  x.report do
    1000.times do
      ActionView::CompiledTemplates.module_eval("def testme\nend")
    end
  end
end
```

This revealed a 11x jump in the time spent in `core#define_method`
alone.

Rails 6 fixes this behavior by moving the `include CompiledTemplates`
into ActionView::Base so that including `ActionView::Context` doesn't
quietly affect other modules in this way.

Closes https://gitlab.com/gitlab-org/gitlab-ee/issues/11198

Fix text based on example

See merge request gitlab-org/gitlab-ce!27787

Fix links to wiki pages with subdirectories in search

Closes #56234

See merge request gitlab-org/gitlab-ce!27400

This commit contains the patch suggested by @fjsanpedro in the issue
covering broken links in wiki search results.

Fixes https://gitlab.com/gitlab-org/gitlab-ce/issues/56234

Upgrade CI images to use Chrome V73

See merge request gitlab-org/gitlab-ce!27762

Port changes for design management to CE

See merge request gitlab-org/gitlab-ce!27555

Resolve "Deployment jobs broken as of 11.10.0"

Closes #60821

See merge request gitlab-org/gitlab-ce!27687

Fix GitHub oAuth test

Closes gitlab-org/quality/nightly#98

See merge request gitlab-org/gitlab-ce!27736

Load environment metrics only for JSON endpoint

See merge request gitlab-org/gitlab-ce!27743

When showing the HTML version of the environment metrics we don't need
to fetch their metrics because we don't use them anymore on the HTML
version.

We use additional_metrics.json endpoint now.

Avoid links requiring permissions

Closes #59653

See merge request gitlab-org/gitlab-ce!27797

Init MR Popovers on system note mounted

Closes #60855

See merge request gitlab-org/gitlab-ce!27747

Fix Profiler to work with Rails 5.1

Closes #61051

See merge request gitlab-org/gitlab-ce!27774

Add gitaly session id & catfile-cache feature flag

See merge request gitlab-org/gitlab-ce!27472

Quarantine failing test

See merge request gitlab-org/gitlab-ce!27799

This ports the changes from
https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/10462/
to CE

Add email clarification

See merge request gitlab-org/gitlab-ce!27645

Add clarification on namespace creation

See merge request gitlab-org/gitlab-ce!27772

fix include example

See merge request gitlab-org/gitlab-ce!27571

Docs: Environments Documentation review

See merge request gitlab-org/gitlab-ce!27215

Merge branch 'docs/60785-docs-feedback-masked-variables-is-not-clear-what-unescaped-characters-means' into 'master'

Clarify masked variables docs

Closes #60785

See merge request gitlab-org/gitlab-ce!27580

- Add note that must contain only letters, numbers, underscore
- Add example of escape characters
- Add regex used for validation

closes https://gitlab.com/gitlab-org/gitlab-ce/issues/60785

https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/27687