Considerably improve the loading time on merge request's discussion page

Closes #52950

See merge request gitlab-org/gitlab-ce!23857

Handle nil terminals in Clusters::Platforms::Kubernetes

Closes #55551

See merge request gitlab-org/gitlab-ce!23925

Add % prefix to milestone reference link text

Closes #53907

See merge request gitlab-org/gitlab-ce!23928

Reorder sidebar menu item for group clusters

Closes #55536

See merge request gitlab-org/gitlab-ce!24001

Bump CarrierWave to 1.3.0 and remove monkey patches

See merge request gitlab-org/gitlab-ce!24019

Use existing users in ee_assign_code_owners_spec.rb if signup is disabled

Closes gitlab-org/quality/staging#20

See merge request gitlab-org/gitlab-ee!8968

Return an ApplicationSetting in CurrentSettings

See merge request gitlab-org/gitlab-ce!23766

Enable some frozen string in ee/lib

See merge request gitlab-org/gitlab-ee!8930

Support new syntax for SAST/Dependency Scanning

See merge request gitlab-org/gitlab-ee!8869

Fix clone dropdown parent inheritance issues in HAML

See merge request gitlab-org/gitlab-ce!24029

Add word-break to issue title to fix edit button disspearing

Closes #55484

See merge request gitlab-org/gitlab-ce!23948

EE Port: Fix clone dropdown parent inheritance issues in HAML

See merge request gitlab-org/gitlab-ee!8969

The change in https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/24015
caused some parent relationships to be incorrect. This caused a failure
in the EE failure the Geo button was added because the modal stopped
showing.

Using find_elements instead of all_elements

Closes gitlab-org/quality/staging#18

See merge request gitlab-org/gitlab-ce!23977

Merge remote-tracking branch 'upstream/master' into 54953-error-500-viewing-merge-request-due-to-nil-commit_email_hostname

* upstream/master: (115 commits)
  [CE] Speed up login page usage
  Add new line and comments
  Fix the seeder 24_forks.rb cannot find public project
  Milestones on community contribution issues
  Removed Gitlab Upgrader found in /lib/gitlab/upgrader.rb
  Fix and move specs into admin_disables_git_access_protocol_spec.rb
  Fix HTTP/SSH clone panel for mobile
  Add spec for HTTP/SSH clone panel
  Fix missing Git clone button when protocol restriction setting enabled
  Fix deprecation: Using positional arguments in integration tests
  Extend override check to also check arity
  Update tm cli version
  Bump Gitaly version to v1.12.0
  Add @dbalexandre to CODEOWNERS
  Update verbiage for clarity
  Change group-cluster beta to regular note
  Change alpha states to use note instead of warning
  Update registry section. Update serverless.yaml formatting
  Clarify obtaining application URL
  Add @godfat to CODEOWNERS
  ...

Resolve "Extend `override` check to also check arity"

Closes #42125

See merge request gitlab-org/gitlab-ce!23498

EE: Resolve "Extend `override` check to also check arity"

See merge request gitlab-org/gitlab-ee!8960

The change in https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/24015
caused some parent relationships to be incorrect. This caused a failure
in the EE failure the Geo button was added because the modal stopped
showing.

[EE] Speed up login page usage

See merge request gitlab-org/gitlab-ee!8963

[CE] Speed up login page usage

See merge request gitlab-org/gitlab-ce!24021

Fix the seeder 24_forks.rb cannot find public project

See merge request gitlab-org/gitlab-ce!24031

CE upstream - 2018-12-25 08:11 UTC

Closes gitlab-ce#55676

See merge request gitlab-org/gitlab-ee!8964

The change in https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/24015
caused some parent relationships to be incorrect. This caused a failure
in the EE failure the Geo button was added because the modal stopped
showing.

Use date from the past to ensure timeago rendering absolute value

Closes #8985

See merge request gitlab-org/gitlab-ee!8966