Docs: update repo mirroring

Closes #3030

See merge request !2808

Fixes bug where mirror trigger builds is nil at project create.

See merge request !2797

CE upstream: Wednesday

Closes gitlab-ce#37147, gitlab-ce#36804, gitlab-ce#36633, gitlab-ce#34323, and gitlab-ci-multi-runner#2696

See merge request !2787

Remove Geo system hooks

See merge request !2644

Add LDAP sync endpoint to Groups API

Closes #2304

See merge request !2785

EE port of enable-new-navigaton-by-default

See merge request !2795

Docs: port article to EE

See merge request !2799

Change wording about the ssh key of Geo nodes admin page

Closes #3290

See merge request !2794

Merge branch '31273-creating-an-project-within-an-internal-sub-group-gives-the-option-to-set-it-a-public-ee' into 'master'

Port of "Resolve various visibility level settings issues" to EE

See merge request !2793

Add missing import statements

Closes #3268

See merge request !2791

* upstream/master: (107 commits)
  Decrease ABC threshold to 55.25
  Adds a tooltip to the branch name
  Optimize system note service specs
  Decrease Metrics/PerceivedComplexity threshold to 17
  Upgrade mail and nokogiri gems due to security issues
  Link out to stackoverflow answer on setting swappiness
  Document swappiness recomendations in the requirements doc
  Migrate Repository.FetchRemote to Gitaly
  Fix invalid attribute used for time-ago-tooltip component
  Use the correct scope to avoid triggering all dropdowns
  fix :file_path - add requirements:
  Update latest artifacts doc
  Add changelog entry for flipping verify_certificates
  Default LDAP config verify_certificates to true
  Update share project with groups docs
  remove accidental console.log from karma tests
  update specs to match reorganized monitoring components
  Remove tooltips from new sidebar
  puts back `function` statements
  Removes disabled state from projects dropdown in dashboard page
  ...

Optimize system note service specs

See merge request !13958

Fix the /projects/:id/repository/files/:file_path/raw endpoint to handle dots in the file_path…

Closes #31470

See merge request !13512

Migrate Repository.FetchRemote to Gitaly

See merge request !13625

Decrease ABC threshold to 55.25

See merge request !13904

Removes disabled state from projects dropdown in dashboard page

Closes #37179

See merge request !13933

Adds a tooltip to the branch name

Closes #36917

See merge request !13925

Decrease Metrics/PerceivedComplexity threshold to 17

See merge request !13947

Resolve "Predefined Variable GITLAB_USER_NAME"

Closes #26692

See merge request !13824

Use google-protobuf 3.4.0.2

See merge request !13796

* master: (65 commits)
  Upgrade mail and nokogiri gems due to security issues
  Link out to stackoverflow answer on setting swappiness
  Document swappiness recomendations in the requirements doc
  Fix invalid attribute used for time-ago-tooltip component
  Update latest artifacts doc
  Add changelog entry for flipping verify_certificates
  Default LDAP config verify_certificates to true
  Update share project with groups docs
  remove accidental console.log from karma tests
  update specs to match reorganized monitoring components
  Remove tooltips from new sidebar
  Use `git update-ref --stdin -z` to delete refs
  Don't use public_send in destroy_conditionally! helper
  Remove unused expressions policy from ci/cd config
  Simplify code for appending strategies in CI/CD config
  Raise exception when simplifiable ci entry incomplete
  Add changelog entry
  Fix MySQL failure for emoji autocomplete
  max-width for lazy-loaded images (this was removed in the original MR through merge resolution most probably)
  Make namespace dropdown on new project page consistent
  ...

* ee/master: (89 commits)
  Merge branch '36807-gc-unwanted-refs-after-import' into tmp
  EE port of remove-sidebar-title
  Make namespace dropdown on new project page consistent
  Adds CE to EE compatibility with 2756
  Fixed Test
  Back to simple headlines without specific branching
  Add my-reaction filter (EE)
  Let's do JS later
  Add a spec when ressource is not modified
  Add changelog and doc
  Add tests for the unmodified header
  Update remaining endpoints
  Use commit date for branches and tags
  Conditionally destroy a ressource
  API: Respect the 'If-Unmodified-Since' for delete endpoints
  Fixes activation of project mirror when project is created.
  Kick off the pipelines again
  Fixed the default callout_id state
  Adjustments to calling logic
  Mapped correct setup
  ...

Make merge request version dropdowns consistent

See merge request !13590

Make namespace select dropdowns consistent

See merge request !13626

Closes gitlab-org/gitlab-ee#3290.