Sidekiq jobs frequently spawn long-lived child processes to do work.
In some circumstances, these can be reparented to init when sidekiq is
terminated, leading to duplication of work and strange concurrency
problems.

This commit changes sidekiq so that, if run as a process group leader,
it will forward `INT` and `TERM` signals to the whole process group. If
the memory killer is active, it will also use the process group when
resorting to `kill -9` to shut down.

These changes mean that a naive `kill <pid-of-sidekiq>` will now do the
right thing, killing any child processes spawned by sidekiq, as long as
the process supervisor placed it in its own process group.

If sidekiq isn't a process group leader, this new code is skipped.

SIGSTP should be SIGTSTP

Closes #40396

See merge request gitlab-org/gitlab-ce!25682

Use `folder-open` from sprite icons for Browse Files button in Tag page

Closes #58274

See merge request gitlab-org/gitlab-ce!25635

Adds documentation for frontend single repo move

See merge request gitlab-org/gitlab-ce!25650

Move EE differences in CE diff files into CE

Closes gitlab-ee#9969, gitlab-ee#9973, and gitlab-ee#9974

See merge request gitlab-org/gitlab-ce!25678

Bump fog-aws to 3.3.0 and associated dependencies

See merge request gitlab-org/gitlab-ce!21788

Fix inconsistent `branch?` behavior between Ci::Pipeline and Ci::Build

See merge request gitlab-org/gitlab-ce!25629

Closes https://gitlab.com/gitlab-org/gitlab-ee/issues/9974, https://gitlab.com/gitlab-org/gitlab-ee/issues/9973, https://gitlab.com/gitlab-org/gitlab-ee/issues/9969

IssuableFinder - Always use CTE for group counts

Closes #54643

See merge request gitlab-org/gitlab-ce!25411

Fixes issue with AWS V4 signatures not working with Ceph S3:
https://github.com/fog/fog-aws/issues/462

Link to instructions to run SSH tests on GDK

See merge request gitlab-org/gitlab-ce!25661

between Ci::Pipeline and Ci::Build

Add spec

Add more tests

ok

Freeze date in merge request status view spec

See merge request gitlab-org/gitlab-ce!25671

Update convdev.md for clarity

See merge request gitlab-org/gitlab-ce!25626

Docs: Replace issue with a link to the feature

See merge request gitlab-org/gitlab-ce!25670

Increase jupyter seo

See merge request gitlab-org/gitlab-ce!25663

Minor grammar update

See merge request gitlab-org/gitlab-ce!25643

Improve labels select rendering

Closes #48230 and #57734

See merge request gitlab-org/gitlab-ce!25281

Previously, when this spec ran on the 28th of February, "one month ago"
isn't actually a month ago, it's "28 days ago".

Now we freeze the date to one that works as intended, since the point of
the test is only that it shows a relative date in the tooltip, not
necessarily that it's an exact, specific date.

Externalize markdown toolbar tooltips

Closes #53413

See merge request gitlab-org/gitlab-ce!25529

Replace tooltip texts in the markdown toolbar with bindings to gettext
calls

Author:    Enrique Alcantara <enrique@crunch.io>

Refactor note_form_spec.js to use Vue test utils

See merge request gitlab-org/gitlab-ce!25571

bin/background_jobs: use pgroups

Closes #40396

See merge request gitlab-org/gitlab-ce!25654

Remove an obsolete workaround for GRPC unavailable errors

See merge request gitlab-org/gitlab-ce!25645

Resolve "Broken master due to stylelint errors"

Closes #58362

See merge request gitlab-org/gitlab-ce!25662

Pare down create_project_with_auto_devops_spec

See merge request gitlab-org/gitlab-ce!25577

Resolve "Update the spinner component"

Closes #20084

See merge request gitlab-org/gitlab-ce!25186