First round of review, main changes:
- templates.title is human readable, #name will be passed around
- GitLabProjectImporterService has been renamed

First iteration, and some stuff is missing. But basically this rake task
does a clone of a project we've pointed it to. Than creates a project on
the GDK, which should be running in the background. This project is
exported, after which we move that archive to the location we need it.
We clean up by removing the generated project.

The first idea was to export the project on .com too, however than we
might run into ImportExport versions mismatch. This could've been
circumvented by checkout out an older commit locally. This however is
not needed yet, so we opted to not go this route yet, instead we will
iterate on what we got.

Started implementation for the first iteration of
gitlab-org/gitlab-ce#32420. This will allow users to select a template
to start with, instead of an empty repository in the project just
created.

Internally this is basically a small extension of the ImportExport
GitLab projects we already support. We just import a certain import
tar archive. This commits includes the first one: Ruby on Rails. In the
future more will be added.

Load the sessionscontroller after loading the ldap strategies

Closes #35447

See merge request !13049

Fixed issue boards sidebar close button with new navigation

Closes #35296

See merge request !12991

Otherwise the token might be cleared before authentication is
done, causing the authentication itself to fail

fix resize bug for title and collapsible nav menus

Closes #35156

See merge request !12904

Resolve "Lazy load images on the Frontend"

Closes #34361

See merge request !12503

Resolve "Error 500 viewing notes with anonymous user"

Closes #35444

See merge request !13037

Use `match_array` rather than `eq` in ProjectsFinder spec

Closes #35489

See merge request !13052

The `members` table can have entries where `user_id: nil`, because people can
invite group members by email. We never want to include those as members,
because it might cause confusion with the anonymous (logged out) user.

Add UX debt label to the contribution guidelines

See merge request !13045

Add GitLab-specific concerns to code review guide

Closes #35099

See merge request !12999

Fix today day highlight in calendar

Closes #32169

See merge request !13048

Use a unique feature name for Workhorse send blob migration

See merge request !13031

Fix translations for Star/Unstar in JS file

Closes #35391

See merge request !13013

Fixed duplicate new milestone buttons in new navigation

Closes #35454

See merge request !13033

Add Slack and JIRA services counts to Usage Data

Closes #31533

See merge request !12974

Associate Issues tab only with internal issues tracker

Closes #33097

See merge request !12130

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

gitlab-design#29

Fix bug causing truncation of Metrics files

See merge request !13035

Upgrade the re2 gem to 1.1.0

See merge request !13036

Fix currently invalid po files

Closes #35302 and #35235

See merge request !13032

Decrease ABC threshold to 56.96

See merge request !11227