If the PostgreSQL Foreign Data Wrapper (postgres_fdw) extension is available,
we can optimize cross-database queries by using that. We automatically
detect if it is available and fallback to the non-FDW version.

Part of #3382

CE upstream

Closes #2709, gitaly#654, and gitlab-ce#36417

See merge request gitlab-org/gitlab-ee!3159

CE upstream: Friday

Closes gitaly#586, gitlab-ce#38871, and gitaly#629

See merge request gitlab-org/gitlab-ee!3144

Make the maximum capacity of Geo backfill operations configurable

Closes #3532

See merge request gitlab-org/gitlab-ee!3107

* ee/master:
  Port of fl-autodevops-fix to EE
  Port Git alternate dirs fix to EE
  Fix default crontab for Geo::FileDownloadDispatchWorker
  Allow the default branch as branch name
  Geo: Don't sync disabled project wikis

Geo: Don't sync disabled project wikis

Closes #3569

See merge request gitlab-org/gitlab-ee!3109

Add ability to pass class name to spriteIcon helper

Closes #39079

See merge request gitlab-org/gitlab-ce!14855

Fix link to "Job Permissions"

See merge request gitlab-org/gitlab-ce!14896

Remove extra border radius when editing a file

Closes #37978

See merge request gitlab-org/gitlab-ce!14803

Update new project docs

See merge request gitlab-org/gitlab-ce!14893

Port of fl-autodevops-fix to EE

See merge request gitlab-org/gitlab-ee!3145

39035 Move GitLab export option to top of import list when creating a new project

Closes #39035

See merge request gitlab-org/gitlab-ce!14830

Remove banner from pipelines page

Closes #38641, #39051, and #38827

See merge request gitlab-org/gitlab-ce!14849

Remove "boards" from TOP_LEVEL_ROUTES

Closes #39073

See merge request gitlab-org/gitlab-ce!14861

Adds requirements that supports anything in sha params

Closes #26561 and #2709

See merge request gitlab-org/gitlab-ce!14462

Allow the default branch as branch name

Closes #3670

See merge request gitlab-org/gitlab-ee!3154

Resolve "GitlabUsagePingWorker is not running on GitLab.com"

See merge request gitlab-org/gitlab-ce!14867

Add Performance category to the changelog

Closes #36417

See merge request gitlab-org/gitlab-ce!14865

Port Git alternate dirs fix to EE

See merge request gitlab-org/gitlab-ee!3157

Upgrading Monaco

Closes #38607

See merge request gitlab-org/gitlab-ce!14629

Fix default crontab for Geo::FileDownloadDispatchWorker

Closes #3771

See merge request gitlab-org/gitlab-ee!3155

Add Test::Integration::Mattermost

See merge request gitlab-org/gitlab-ce!14818

* ee/master:
  Linter fixes
  Test PostgreSQL 9.6 and postgres_fdw with Geo specs
  Move line code generation into Gitlab::Git
  Create a Gitlab::Git submodule for conlict-related files
  Refactor conflict resolution to contain git ops within Gitlab::Git
  Clean hierarchy of calls between models and Gitalb::Git for blob search
  Move Gitlab::Diff::LineCode to module Gitlab::Git
  Encapsulate git operations for conflict resolution into lib
  Popen with a timeout
  EE version of ph-shortcut-js-modules
  Memoize migration files per migrations paths
  Remove duplicated sections
  Remove +x permission from app/assets/images/favicon-green.ico
  added date parameter for time tracking
  add spec for projects
  tests for sidebar labels
  fix creating labels from Group Boards sidebar