* master: (84 commits)
  Migrate Gitlab::Git::Wiki#page to Gitaly
  Load participants async
  Normalize LDAP DN when looking up identity
  Improve the maintenance policy page
  add changelog
  fix spec failure
  Allow promoting project milestones to group milestones
  fix specs
  Be able to bundle gems with newer rubies
  Upgrade Ruby to 2.3.5
  fixed up upload feature after master merge
  fix missing issue assignees
  Migrate Gitlab::Git::Wiki#delete_page to Gitaly
  Enable eslint
  Make `#hashed_storage?` require feature argument
  Adds callback function to inital cluster request
  Fix example typo.
  Upload files through the multi-file editor
  get branch name from the DOM
  Resolve "Convert autosize.js library to be a Yarn managed library"
  ...

Migrate Gitlab::Git::Wiki#page to Gitaly

Closes gitaly#677

See merge request gitlab-org/gitlab-ce!14955

Normalize LDAP DN when looking up identity

Closes #39559

See merge request gitlab-org/gitlab-ce!15103

Bump carrierwave to 1.2.1

Closes #39580

See merge request gitlab-org/gitlab-ce!15072

Move multi-file editor store to Vuex

See merge request gitlab-org/gitlab-ce!15046

Closes gitaly#677

Upgrade Ruby to 2.3.5

See merge request gitlab-org/gitlab-ce!15099

Improve the maintenance policy page

See merge request gitlab-org/gitlab-ce!15112

Load participants async

Closes #23206

See merge request gitlab-org/gitlab-ce!14836

Fix missing issue assignees

Closes #39170

See merge request gitlab-org/gitlab-ce!15109

Make clear that we may backport bug fixes to the previous stable
release.
Signed-off-by: Rémy Coutable <remy@rymai.me>

Fix overlap of right-sidebar and wiki create page form

Closes #39509

See merge request gitlab-org/gitlab-ce!15075

Adds project_id to pipeline hook data

Closes #31454

See merge request gitlab-org/gitlab-ce!15044

Allow promoting project milestones to group milestones

Closes #38777

See merge request gitlab-org/gitlab-ce!14831

Migrate Gitlab::Git::Wiki#delete_page to Gitaly

Closes gitaly#673

See merge request gitlab-org/gitlab-ce!14910

Handle large values on `MergeRequestDiffCommit` dates

Closes #39561

See merge request gitlab-org/gitlab-ce!15093

Fix example typo.

See merge request gitlab-org/gitlab-ce!15104

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

Part of gitlab-org/gitlab-ce#38040

Remove issue and issue status select from global namespace

See merge request gitlab-org/gitlab-ce!15090

Hashed Storage support for Attachments

See merge request gitlab-org/gitlab-ce!15068

Adds callback function to initial cluster request

Closes #39639

See merge request gitlab-org/gitlab-ce!15105

Fix namespacing for MergeWhenPipelineSucceedsService in MR API

Closes #39619

See merge request gitlab-org/gitlab-ce!15088