Port to EE: Cleanup legacy artifact background migration

Closes gitlab-ce#46866

See merge request gitlab-org/gitlab-ee!9106

Resolve "Remove expansion hover animation from status icon buttons"

Closes #42769

See merge request gitlab-org/gitlab-ce!24268

Refactor "Allow edits from maintainers in forks" docs

See merge request gitlab-org/gitlab-ce!24426

Fix EE codebase after refactoring github repository import

Closes #9256 and #9257

See merge request gitlab-org/gitlab-ee!9211

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

Resolve "Duplicate Maven result should be hidden"

Closes #9047

See merge request gitlab-org/gitlab-ee!9151

Improve MilestonesFinder to accept project and group relations

Closes #47988

See merge request gitlab-org/gitlab-ce!24325

Show CI artifacts size with 3 significant digits

Closes #56363

See merge request gitlab-org/gitlab-ce!24387

Change width of .dropdown-menu-toggle to 160px

See merge request gitlab-org/gitlab-ce!24391

Moves index page of feature flags completely to Vue

See merge request gitlab-org/gitlab-ee!9155

Backport github import fix from EE

See merge request gitlab-org/gitlab-ce!24462

Update issue template with user journey, persona label additions, and clarification between success metrics and acceptance criteria

See merge request gitlab-org/gitlab-ee!9186

Update issue template with user journey, persona label additions, and clarification between success metrics and acceptance criteria

Update issue template with user journey, persona label additions, and clarification between success metrics and acceptance criteria

See merge request gitlab-org/gitlab-ce!24428

Update issue template with user journey, persona label additions, and clarification between success metrics and acceptance criteria

The expansion hover animation caused a number of layout headaches; this
commit removes the animation and replaces them with hover/active/focus
styles.

Related issue:
https://gitlab.com/gitlab-org/gitlab-ce/issues/42769

Conditionally initialize the global opentracing tracer

See merge request gitlab-org/gitlab-ce!24186

Fix the Epic QA test

Closes gitlab-qa#364

See merge request gitlab-org/gitlab-ee!9194

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

Security Dashboard: Recursively retrieve all projects

Closes #9247

See merge request gitlab-org/gitlab-ee!9205

Per default the project API just returns 20 projects. Now we retrieve a
hundred projects per call. If the group has more than a 100 projects, it
will fetch the next pages as well.

Retry Node QA jobs

See merge request gitlab-org/gitlab-ce!24438

Upgrade Gitaly to 1.13.0

See merge request gitlab-org/gitlab-ce!24429

Fix text and markdown

See merge request gitlab-org/gitlab-ee!9203

Fix text and markdown

See merge request gitlab-org/gitlab-ce!24446

API for importing external repos

Closes #52636

See merge request gitlab-org/gitlab-ce!22809

This change will instantiate an OpenTracing tracer and configure it
as the global tracer when the GITLAB_TRACING environment variable is
configured. GITLAB_TRACING takes a "connection string"-like value,
encapsulating the driver (eg jaeger, etc) and options for the driver.

Since each service, whether it's written in Ruby or Golang, uses the
same connection-string, it should be very easy to configure all
services in a cluster, or even a single development machine to be
setup to use tracing.

Note that this change does not include instrumentation or propagation
changes as this is a way of breaking a previous larger change into
components. The instrumentation and propagation changes will follow
in separate changes.