Make mail notifications of discussion notes In-Reply-To of each other

Closes #36054

See merge request gitlab-org/gitlab-ce!14289

Use author info on commits list page rather than most recent commit date

Closes #25317

See merge request gitlab-org/gitlab-ce!15868

Use a dedicated queue for each Sidekiq worker

See merge request gitlab-org/gitlab-ce!15882

Clarifies documentation for user, group & project transfers

See merge request gitlab-org/gitlab-ce!15896

Export date utility functions as ES6 modules

See merge request gitlab-org/gitlab-ce!15782

Corrected typo in quick action data attribute

Closes #41035

See merge request gitlab-org/gitlab-ce!15872

When a note is part of a discussion, the email sent out will be
`In-Reply-To` the previous note in that discussion. It also
`References` all the previous notes in that discussion, and the
original issue.

Closes gitlab-org/gitlab-ce#36054.

When a note is part of a discussion, the email sent out should be
`In-Reply-To` the previous note in that discussion.

Closes gitlab-org/gitlab-ce#36054

Adds ordering to projects contributors in API

Closes #13695

See merge request gitlab-org/gitlab-ce!15469

Unify dialog modal/popup dialog/confirmation dialog/modal to modal

See merge request gitlab-org/gitlab-ce!15865

Update issuable status icons

Closes #33926

See merge request gitlab-org/gitlab-ce!15898

Cache feature check for 1 minute for MethodCall instrumentation toggle

See merge request gitlab-org/gitlab-ce!15800

Add a gitlab:tcp_check rake task

See merge request gitlab-org/gitlab-ce!15759

Allows ordering in GET api/v4/projects/:project_id/repository/contributors
through `order_by` and `sort` params.
The available `order_by` options are: name|email|commits.
The available `sort` options are: asc|desc.

Prevent worker that updates merge requests head pipeline from failing jobs

Closes #41021

See merge request gitlab-org/gitlab-ce!15870

Enable the performance bar in dev environments

Closes #40989

See merge request gitlab-org/gitlab-ce!15913

This allows us to avoid relying on telnet / netcat being installed

Docs: Update admin docs

See merge request gitlab-org/gitlab-ce!15892

Create models directly in migration specs

See merge request gitlab-org/gitlab-ce!15874

Execute quick actions when creating MR from issue

Closes gitlab-ee#4277

See merge request gitlab-org/gitlab-ce!15810

Add new “Troubleshooting Git” page to General documentation

See merge request gitlab-org/gitlab-ce!15903

Document how to remove assignees, labels, and milestones form the issue and MRs API

See merge request gitlab-org/gitlab-ce!15664

Make usage of SSH keys in CI/CD more clear

Closes #25716

See merge request gitlab-org/gitlab-ce!15790

Updates dependencies license list

See merge request gitlab-org/gitlab-ce!15905

10.3 gitignore and license templates

Closes #10

See merge request gitlab-org/gitlab-ce!15901

10.3 update guide

Closes #10

See merge request gitlab-org/gitlab-ce!15900

10.3 "Installation from Source"

Closes #10

See merge request gitlab-org/gitlab-ce!15899

In CE, this does nothing - the `MergeRequests::BuildService` will, at the time
of writing, never return a description for this case.

In EE, a project can have a default MR template, which will be returned by the
service. Previously we were only using the description passed in the params,
ignoring any already set on the object. Now we fall back to the one set on the
object if there was none in the params, allowing quick actions to be executed
from default MR templates when creating an MR from an issue.