port 36234-nav-add-groups-dropdown to EE

Closes gitlab-ce#36234

See merge request gitlab-org/gitlab-ee!6341

Resolve "Geo - Retry checksum calculation for failures on the primary node"

Closes #6698

See merge request gitlab-org/gitlab-ee!6295

Resolve "Extract EE specific files/lines for Discussion app/services"

Closes #6653

See merge request gitlab-org/gitlab-ee!6392

CE upstream - 2018-07-06 09:21 UTC

See merge request gitlab-org/gitlab-ee!6403

Add support for autocompleting Epics and Labels within Epics

Closes #5604 and #5605

See merge request gitlab-org/gitlab-ee!6195

[EE-Port] Create cross project group features

Closes #4829

See merge request gitlab-org/gitlab-ee!6363

CE upstream - 2018-07-06 00:21 UTC

Closes gitaly#1254, #6753, and #6561

See merge request gitlab-org/gitlab-ee!6401

Check if the existences of archived traces before archive it

Closes #48705

See merge request gitlab-org/gitlab-ce!20297

This allows us to check specific abilities in views, while still
enabling/disabling them at once.

CE for "Remove new contributing link from EE"

See merge request gitlab-org/gitlab-ce!20334

Remove new contributing link from EE

Closes gitlab-ce#47274

See merge request gitlab-org/gitlab-ee!6297

Fix User role displayed on projects dashboard

Closes #43565

See merge request gitlab-org/gitlab-ce!20374

Resolve "GFM preview should have status indicator"

Closes #31583

See merge request gitlab-org/gitlab-ce!20418

support otherwise.

Add spec

Also patch existing classes

Add epics path to autocomplete_data_sources