Add GitLab Geo architecture diagram and clarify LDAP configuration

Closes #2375

See merge request !2098

AWS credentials chain

Closes #2169

See merge request !2020

Avoid using the database in the Geo initializer

See merge request !2099

fix approver placeholder not showing in ie11

Closes #1925

See merge request !2030

don't disable Rebase button for MR without Approvals

Closes #2385

See merge request !2031

Geo - Fix RepositorySyncService when cannot obtain a lease to sync repository

See merge request !2097

CE Upstream - Wednesday

Closes #2563, #2411, gitlab-ce#19219, #2361, and gitlab-ce#31397

See merge request !2060

Make the revision on the `/help` page clickable

See merge request !2089

Fixed not issue boards milestone actions not sticking to bottom of dropdown

Closes gitlab-ce#32002

See merge request !2102

Resolve "ActionView::Template::Error: undefined method `any?' for nil:NilClass"

Closes #2618

See merge request !2090

Closes #32002

For quicker access, add hyperlink to the gitlab.com commits page for the current
REVISION of GitLab.

Fixes deploy board error spec

Closes #2514

See merge request !2064

Running `bundle exec rake geo:db:migrate` would cause the warning to show
since ActiveRecord wasn't set up properly.

Add linked pipelines to mini pipeline graph in MR Widget

Closes #2602

See merge request !2039

Closes #2375

[ci skip]

Backports gitlab-ce!12024

See merge request !2092

Add docs for protected branches deletion feature

Closes gitlab-ce#32218

See merge request !2086

Refactor CI triggers docs

Closes #2616

See merge request !2079

Refactor Runners docs

See merge request !2061

When an MR or issue and there's a conflict, we rescue the StaleObjectError and
render the edit page again. However, for MRs in EE, we need to ensure that
@suggested_approvers is set before that happens, otherwise the view will fail to
render.

Revert "Merge branch '2001-related-issues' into 'master'"

See merge request !2082

Sync email address from specified omniauth provider [EE]

See merge request !2072

Port project translations from CE to EE

See merge request !2066

Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/32218

Fix audit logs spec failing on master

See merge request !2069

This reverts commit b34bc6fe, reversing
changes made to e9fcae37.