Handle node details load failure gracefully on UI

Closes #4511 and #4552

See merge request gitlab-org/gitlab-ee!3992

EE port of main-js-tidy-up

See merge request gitlab-org/gitlab-ee!4016

Docs: move article "installing Git"  to its topic-related dir

See merge request gitlab-org/gitlab-ee!3973

Docs: move article "Laravel and Envoy w/ CI/CD"

See merge request gitlab-org/gitlab-ee!4000

Docs: move GitLab/Openshift article to its topic-related dir

See merge request gitlab-org/gitlab-ee!4004

Add in reference diagram for AWS arch

Closes gitlab-com/customer-success/professional-services#109

See merge request gitlab-org/gitlab-ee!3981

ee-patch for refactor of help and profiles in dispatcher.js

See merge request gitlab-org/gitlab-ee!4018

Epic issues API link

See merge request gitlab-org/gitlab-ee!3998

[EE] Adds Rubocop rule for line break around conditionals

See merge request gitlab-org/gitlab-ee!3919

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EE: Remove soft removals related code

Closes gitlab-ce#37447

See merge request gitlab-org/gitlab-ee!3957

EE projects-dispatcher-refactor

See merge request gitlab-org/gitlab-ee!4015

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

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This removes all usage of soft removals except for the "pending delete"
system implemented for projects. This in turn simplifies all the query
plans of the models that used soft removals. Since we don't really use
soft removals for anything useful there's no point in keeping it around.

This _does_ mean that hard removals of issues (which only admins can do
if I'm not mistaken) can influence the "iid" values, but that code is
broken to begin with. More on this (and how to fix it) can be found in
https://gitlab.com/gitlab-org/gitlab-ce/issues/31114.

Fixes https://gitlab.com/gitlab-org/gitlab-ce/issues/37447

CE upstream - Wednesday

Closes gitaly#873 and gitaly#903

See merge request gitlab-org/gitlab-ee!3994

Resolve "Geo secondary can't query geo node status from primary"

Closes #4518

See merge request gitlab-org/gitlab-ee!3997

Adds a Rubocop rule (with autocorrect) to ensure line break around
conditionals.
Signed-off-by: Rémy Coutable <remy@rymai.me>

added missing content-type header to POST/PUT requests

See merge request gitlab-org/gitlab-ee!4014

EE port of admin-dispatcher

See merge request gitlab-org/gitlab-ee!3970

Validate GitLab QA selectors / EE

See merge request gitlab-org/gitlab-ee!3993

Refactor dashboard activities path (EE Version)

See merge request gitlab-org/gitlab-ee!4002

Refactor dispatcher sessions path (EE Version)

See merge request gitlab-org/gitlab-ee!4003