Move tag services to `Tags` namespace

See merge request !9231

Fix Rubocop offense

See merge request !9274

Fix regression where cmd-click stopped working for todos and merge request tabs

Closes #27922

See merge request !9115

Resolve 'Alphabetically sort tags on runner list'

Closes #27409

See merge request !8922

Remove deprecated CI service

Closes #28094

See merge request !9221

Specify that only project owners can transfer a project

Closes #26651

See merge request !9262

Add missing api entities

Closes #23895

See merge request !7138

Only load istanbul plugin in development mode

See merge request !9261

Stop Pikaday using moment

See merge request !9244

Show notifications settings even when repository feature is disabled

See merge request !9180

# Conflicts:
#   db/schema.rb

Fix labels being applied to wrong merge requests on GitHub import

See https://dev.gitlab.org/gitlab/gitlabhq/merge_requests/2064

Fix for XSS vulnerability in SVG attachments

See https://dev.gitlab.org/gitlab/gitlabhq/merge_requests/2059

Fix XSS in rdoc and other markups

See https://dev.gitlab.org/gitlab/gitlabhq/merge_requests/2058

Add sanitization filter to asciidocs output to prevent XSS

See https://dev.gitlab.org/gitlab/gitlabhq/merge_requests/2057

Centers loading icon vertically and horizontally in pipelines table in commit view

Closes #28229

See merge request !9256

[skip ci]

Layout alignment fix in new project and edit project screen

See merge request !9201

Disable invalid service templates

Closes #25112

See merge request !8850

Rename builds to jobs in docs

See merge request !9204

Fix stray pipelines API request when showing MR

Closes #27925

See merge request !9213

[ci skip]

Don't ignore the parameter of MergeRequestsHelper#mr_change_branches_path

See merge request !9223

Nested groups improvements pt 3

See merge request !9227

Make it possible to pass coverage value to commit status API

Closes #27807

See merge request !9214

Fixes https://gitlab.com/gitlab-org/gitlab-ce/issues/27925

SidekiqStatus need to be qualified in some cases

Closes #27759

See merge request !9235

Fix z index bugs

Closes #28142

See merge request !9236

Fix smaller height of Activity header page

Closes #27631

See merge request !8952

[ci skip]