EE port: Make external_dashboard_url available to frontend

See merge request gitlab-org/gitlab-ee!12345

- Modify it to test the EE keys in metrics_data rather than all keys,
some of which are defined in the CE EnvironmentsHelper.

Add details of the Admin Area's *Users* page

See merge request gitlab-org/gitlab-ce!28509

Remove EE specific lines from spec/lib/system_check/app/git_user_default_ssh_config_check_spec.rb

Closes #6495

See merge request gitlab-org/gitlab-ee!13166

Resolve "Extract EE specific files/lines for spec/controllers/admin"

Closes #6569

See merge request gitlab-org/gitlab-ee!13280

Resolve "Extract EE specific files/lines for spec/features/admin"

Closes #6572

See merge request gitlab-org/gitlab-ee!13378

Add LFS pull mirroring to docs

See merge request gitlab-org/gitlab-ce!28686

Remove the circuit breaker API

Closes #52467

See merge request gitlab-org/gitlab-ce!28669

Resolve "Style secondary button type to be aligned with pattern library"

See merge request gitlab-org/gitlab-ce!27920

Fix bug candidates of forms on Bootstrap Grid system

Closes #57189

See merge request gitlab-org/gitlab-ce!24885

Added parent table row to files table

See merge request gitlab-org/gitlab-ce!28658

Masked should be Boolean type

See merge request gitlab-org/gitlab-ce!28758

Add developmenty documentation about routing

See merge request gitlab-org/gitlab-ce!28533

Explain and recommend developers to use `/-/` scope for group and
project routes in Rails
Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

Add benchmark-memory Ruby gem

See merge request gitlab-org/gitlab-ce!28762

Adds a confidence filter to the GSD

See merge request gitlab-org/gitlab-ee!12805

Resolve "Validate k8s credentials provided at cluster creation"

Closes #55447

See merge request gitlab-org/gitlab-ce!27403

Added a changelog entry for the feature

Port of Validate k8s credentials provided at cluster creation

See merge request gitlab-org/gitlab-ee!12226

Added a changelog entry for the feature

Add expand/collapse button to error tracking settings

See merge request gitlab-org/gitlab-ce!28619

Add ability to expand/collapse error tracking settings

Add Object.entries polyfill for IE11 compatibility

See merge request gitlab-org/gitlab-ce!28732

Fix security dashboard errors on IE11

See merge request gitlab-org/gitlab-ee!13319

Be explicit about setting :masked

See merge request gitlab-org/gitlab-ce!28759

Signed-off-by: Takuya Noguchi <takninnovationresearch@gmail.com>