Add support for ssh certificates (internal API)

Closes #34572

See merge request gitlab-org/gitlab-ce!19911

Update test-and-deploy-python-application-to-heroku.md

See merge request gitlab-org/gitlab-ce!20921

Rails5: fix flaky spec

See merge request gitlab-org/gitlab-ce!20953

Resolve "Allow issue's Internal ID (`iid`) to be set when creating via the API"

Closes #1756

See merge request gitlab-org/gitlab-ce!20626

Fix a few disrepencies between CE and EE in the lines ordering

See merge request gitlab-org/gitlab-ce!20937

Resource event model

Closes #47993

See merge request gitlab-org/gitlab-ce!20606

[CE Port]: Implement instance level project templates

See merge request gitlab-org/gitlab-ce!20761

Show one digit after dot in commit_per_day value in charts page.

Closes #26512

See merge request gitlab-org/gitlab-ce!20896

Search for label on project labels page by title or description

See merge request gitlab-org/gitlab-ce!20749

Why and how to enable this is covered in the docs being changed
here. This requires gitlab-org/gitlab-shell@2e8b670 ("Add support for
SSH certificate authentication", 2018-06-14) which has been merged in
and tagged as 8.0.0, so GITLAB_SHELL_VERSION needs to be bumped.

Merging this closes gitlab-org/gitlab-ce#34572 see
gitlab-org/gitlab-shell!207 for the gitlab-shell MR.

Implementation notes:

 - The APIs being changed here are all internal, and their sole
   consumer is gitlab-shell.

 - Most of the changed code is a MR to gitlab-shell, see the
   gitlab-org/gitlab-shell!207 MR. That change covers why only some of
   the internal methods get a new "username" parameter, and why some
   others only get a "user_id".

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

Add local project uploads cleanup task

See merge request gitlab-org/gitlab-ce!20863

Enable no-console ESLint rule for tests

See merge request gitlab-org/gitlab-ce!20812

Fix LFS uploads not working with git-lfs 2.5.0

Closes #49752

See merge request gitlab-org/gitlab-ce!20923

Revert "Merge branch '48098-mutual-auth-cluster-applications' into 'master'"

See merge request gitlab-org/gitlab-ce!20925

Code cleaning in PostReceive services

See merge request gitlab-org/gitlab-ce!20916

Remove git rake tasks

Closes #41699 and gitaly#768

See merge request gitlab-org/gitlab-ce!20806

This reverts merge request !20801

git-lfs 2.5.0 now sets the Content-Type header instead of hard-coding it to
application/octet-stream: https://github.com/git-lfs/git-lfs/pull/3137

To avoid this issue, we explicitly tell the client to use
application/octet-stream.

Closes #49752

Delete todos when users loses target read permissions

See merge request gitlab-org/gitlab-ce!20665

While reviewing this branch it was noted that this task was broken.
Given the limited value this task brings, and given the fact that much
of the old behaviour has been moved to be automatically fixed, removing
was a good option.

Suggestion in:
https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/20806#note_91261001

This branch includes changes that removes a rake taks that cleans up
config.lock files.

This change bumps Gitaly so it happens automatically so users don't have
to bother.

These tasks are happening through housekeeping right now, by default
ever 10th push. This removes the need for these tasks.

Side note, this removes one of my first contributions to GitLab, as back
than I introduced these tasks through: 54e6c004

Closes https://gitlab.com/gitlab-org/gitaly/issues/768

Update total storage size when changing size of artifacts

See merge request gitlab-org/gitlab-ce!20697

CE application settings (not Docs) Cleanup

See merge request gitlab-org/gitlab-ce!20723

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

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

Add user authentication activity metrics

Closes #47789

See merge request gitlab-org/gitlab-ce!20668

Fix authorization for interactive web terminals

See merge request gitlab-org/gitlab-ce!20811

Resolve "MR refactor: Disable toggle comments button when diff has no discussions"

Closes #49161

See merge request gitlab-org/gitlab-ce!20667

Depends on if prioritised or other labels are found or no labels at all
are found, we show a corresponding message now
Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>