Get the `merge-base` of 2 refs trough the API

Closes #49850

See merge request gitlab-org/gitlab-ce!20929

Improve terminal button on job log page

See merge request gitlab-org/gitlab-ce!21094

This adds an endpoint to get the common ancestor of 2 refs from the API.

Fix specs failing on duplicate gpg signature

Closes #50224

See merge request gitlab-org/gitlab-ce!21152

Update diff docs regarding note diff file usage

See merge request gitlab-org/gitlab-ce!21137

Creates vue component for warning block about stuck runners

See merge request gitlab-org/gitlab-ce!21114

Added tooltips to tree list header buttons in Web IDE

Closes #50141

See merge request gitlab-org/gitlab-ce!21138

Fixed Web IDE live preview not hot reloading

Closes #50231

See merge request gitlab-org/gitlab-ce!21141

Add documentation on how to test on older firefox versions

See merge request gitlab-org/gitlab-ce!20842

Backstage/ide router refactoring

See merge request gitlab-org/gitlab-ce!21142

It seems there are additional async requests related to gpg
signature, w/o waiting for finishing all requests it fails on:
Duplicate entry '...' for key 'index_gpg_signatures_on_commit_sha'

fix design artifact label to be product discovery. Was done here…

See merge request gitlab-org/gitlab-ce!21135

Bugs and regression triage and prioritization process

See merge request gitlab-org/gitlab-ce!20623

Reorganize variables.scss, Part 1

See merge request gitlab-org/gitlab-ce!21118

Resolve "Add missing i18n strings to issue boards."

Closes #50063

See merge request gitlab-org/gitlab-ce!21081

Merge branch '47752-buttons-on-new-file-page-wrap-outside-of-container-for-long-branch-names' into 'master'

Resolve "Buttons on new file page wrap outside of container for long branch names"

Closes #47752

See merge request gitlab-org/gitlab-ce!21015

Resolve "Group Overview list items layout regression"

Closes #50176

See merge request gitlab-org/gitlab-ce!21124

Add frozen_string_literal to recently-added files from the community

See merge request gitlab-org/gitlab-ce!21132

Resolve "Consider enforcing the use of the new Ruby safe navigation operator (aka `&.`)"

Closes #27884

See merge request gitlab-org/gitlab-ce!21140

Resolve ""Block user" section in admin area has wrong styling"

Closes #50126

See merge request gitlab-org/gitlab-ce!21095

Updates permission checks to use paths instead - backend already handles permissions

Resolve "Clarify `List user projects` API Endpoint"

Closes #50174

See merge request gitlab-org/gitlab-ce!21121

Regenerate pot files

Signed-off-by: Rémy Coutable <remy@rymai.me>

Closes #50141

Reduce differences between CE and EE code base in reports components

See merge request gitlab-org/gitlab-ce!21128

CE Port of Protected Environments backend

See merge request gitlab-org/gitlab-ce!20859

* master: (66 commits)
  Allows to cancel a Created job
  Enable frozen string in rest of app/models/**/*.rb
  docs: removed duplicate `git_ssh_url` field from build event example
  Bump pry to 0.11.3; pry-byebug to 3.4.3
  Update GitLab Shell to v8.1.1 to fix regressions
  Rails5 fix specs duplicate key value violates unique constraint 'index_gpg_signatures_on_commit_sha'
  Add mock data for spam logs
  Disable danger in preparation branches
  [ci-skip] add changelog
  Add default avatar to group
  Fix label item height when no desc
  Fix docs linting
  Fix missed port
  Consistent padding but correct label-actions-list positioning and label-links margin
  Phase 2: #47282 Improving Contributor On-Boarding Documentation
  Fix label item height when no desc
  Resolve "docs update api for usage with an array of hashes"
  removed un-used commits for currentProject & currentBranchId
  Allow the Web IDE to open empty merge requests
  Add rubocop check for add_reference to require index.
  ...

fix design artifact label to be product discovery. Was done here https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/20862 but not merged before this was moved.

Resolve "CI: cancel/skip a job in "created" state using a button"

Closes #48320

See merge request gitlab-org/gitlab-ce!20635

port "Resolve "Mirroring interface improvements""

See merge request gitlab-org/gitlab-ce!20837