Return from the `Ci::Pipeline#ref_exists?` in case when there is no
repository present.

This also fixes pipeline page feature specs by changing pipeline
reference instead of stubbing `ref_exist?` method.

* master: (1252 commits)
  Render log artifact files in GitLab
  Check disabled_services when finding a service
  Fix invalid parent path on group settings page
  Backport CE changes for: [Frontend only] Batch comments on merge requests
  Add button to insert table in markdown editor
  Update GITALY_SERVER_VERSION
  Updates Laravel.gitlab-ci.yml template
  Update operations metrics empty state
  Fix LFS uploaded images not being rendered
  Prepare admin/projects/show view to allow EE specific feature
  Add timed incremental rollout to Auto DevOps
  Update spec comment to point to correct issue
  Fix documentation for variables
  Document Security and Licence Management features permissions
  Fix time dependent jobs spec
  Use a CTE to remove the query timeout
  Backport changes from gitlab-ee!7538
  Fix CE to EE merge (backport)
  Add changelog entry
  Refactor Feature.flipper method
  ...

Fix issues controller N+1 failure

See merge request gitlab-org/gitlab-ce!22141

Updates Laravel.gitlab-ci.yml template

See merge request gitlab-org/gitlab-ce!22167

Render log artifact files in GitLab

See merge request gitlab-org/gitlab-ce!22112

Check disabled_services when finding a service

See merge request gitlab-org/gitlab-ce!22172

Fix invalid parent path on group settings page

Closes #52242

See merge request gitlab-org/gitlab-ce!22142

Backport CE changes for: [Frontend only] Batch comments on merge requests

See merge request gitlab-org/gitlab-ce!22158

Add button to insert table in markdown editor

See merge request gitlab-org/gitlab-ce!18480

Bump Gitaly to v0.125.0

See merge request gitlab-org/gitlab-ce!22168

Backport of CE upstream - 2018-10-05 12:21 UTC

See merge request gitlab-org/gitlab-ce!22154

Updates to add gnupgp (required for node setup)
Upgrades node install to version 8

Update operations metrics empty state

See merge request gitlab-org/gitlab-ce!21974

Fix LFS uploaded images not being rendered

Closes #50617

See merge request gitlab-org/gitlab-ce!22092

EE Backport: enable Geo Status widget in admin/projects

See merge request gitlab-org/gitlab-ce!22161

In EE it will render a Geo Status widget when Geo is enabled and it is
in a secondary node.

Also added minimal specs to that action.

Add timed incremental rollout to Auto DevOps

Closes gitlab-ee#7545

See merge request gitlab-org/gitlab-ce!22023

Auto DevOps deployment strategies now supports timed incremental
rollout. We are deprecating the usage of INCREMENTAL_ROLLOUT_ENABLED
environment variable in Auto DevOps template.

The new behavior will be driven by the INCREMENTAL_ROLLOUT_MODE variable
that can either be manual (same as INCREMENTAL_ROLLOUT_ENABLED) or
timed.

Rollout deployments will be executed using a 5 minute delay between each
job.

[broken master] Fix time dependent jobs spec

See merge request gitlab-org/gitlab-ce!22159

Resolve "Controller Projects::MergeRequestsController#ci_environments_status.json executes more than 100 SQL queries"

Closes #43109

See merge request gitlab-org/gitlab-ce!21996

Fix documentation for variables

Closes #51814

See merge request gitlab-org/gitlab-ce!21943

Merge branch '7453_document_security_and_licence_management_features_permissions-docs' into 'master'

Document Security and Licence Management features permissions

See merge request gitlab-org/gitlab-ce!22042

[master] Confidential issue/private snippet titles can be read by unauthenticated user through GFM markdown API

Closes #2706

See merge request gitlab/gitlabhq!2507

Merge branch '50359-activerecord-statementinvalid-pg-querycanceled-error-canceling-statement-due-to-statement-timeout' into 'master'

Resolve "ActiveRecord::StatementInvalid: PG::QueryCanceled: ERROR:  canceling statement due to statement timeout"

Closes #50359

See merge request gitlab-org/gitlab-ce!21893