EE port of https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/12845

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Closes #2925

See merge request !2465

Improve text for codeclimate report

Closes #2951

See merge request !2493

Edit Add GitLab Trello Power-Up Documentation (EE)

See merge request !2499

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Add GitLab Trello Power-Up Documentation

See merge request !12997

Remove suggested approvers text decoration on hover

Closes #2607

See merge request !2487

Fix transient test failure in protected_branches_access_control_ee.rb

See merge request !2439

Fix https://gitlab.com/gitlab-org/gitlab-ee/issues/2925

[Backport] Recommend V4 API usage on chat slash command integrations

See merge request !2494

Include whether the actor is a GeoNode in the `/internal/allowed` endpoint

See merge request !2489

CE upstream: Thursday

Closes gitlab-com/support-forum#2246

See merge request !2486

Docs: update Geo with upgrade instructions

See merge request !2491

Use trigger(:click) in some feature specs to avoid intermittent failures

See merge request !2485

Signed-off-by: Rémy Coutable <remy@rymai.me>

Signed-off-by: Rémy Coutable <remy@rymai.me>

Signed-off-by: Rémy Coutable <remy@rymai.me>

Signed-off-by: Rémy Coutable <remy@rymai.me>

This is needed to support #2959: gitlab-shell or Gitaly will need
to know whether the request is coming from a GeoNode, in which
case we will have some way of disabling the `transfer.hideRefs`
git command in order to mirror all the refs on the primary.

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CE upstream - Wednesday

Closes gitaly#350, gitlab-ce#32561, gitaly#379, #2942, and #2950

See merge request !2475

Wrong data type when testing webhooks

Closes #5971

See merge request !11728