SSoT for API template docs

Closes #64589

See merge request gitlab-org/gitlab-ce!31320

These docs are straightforward API reference material
and needed only to have document type header and
troubleshooting footer added for the SSoT effort.

Remove unnecessary freeze in app

See merge request gitlab-org/gitlab-ce!32636

Adds docs for total usage storage quota

See merge request gitlab-org/gitlab-ce!32600

Upgrade GraphQL gem to 1.8.17

See merge request gitlab-org/gitlab-ce!32299

- Due to https://github.com/exAspArk/batch-loader/pull/32,
we  changed BatchLoader.for into BatchLoader::GraphQL.for
- since our results are wrapped in a BatchLoader::GraphQL,
calling `sync` during authorization is required to get real object
- `graphql` now has it's own authorization system.  Our
`authorized?` method conflicted and required renaming

Add markdownlint-cli to yarn dependencies

See merge request gitlab-org/gitlab-ce!32593

This is the tool that we use to lint the Markdown files.
Let's add it to yarn.lock so that we can use it in
development. Pinned to 0.18.0.

Update eslint-utils to 1.4.2

Fixes vulnerability in development environment.
See https://nvd.nist.gov/vuln/detail/CVE-2019-15657

See merge request gitlab-org/gitlab-ce!32251

Avoid calling freeze on already frozen strings in app/finders

See merge request gitlab-org/gitlab-ce!32634

Add ability to see project deployments at cluster level (FE)

See merge request gitlab-org/gitlab-ce!31575

Added the ability to see project deployments using a group cluster

Let project reporters create issue from group boards

Closes #54042

See merge request gitlab-org/gitlab-ce!29866

The current state of group issue boards does not show the "Add issues"
button on the UI for users that are reporters of group child projects.

Merge branch '60372-milestone-link-prevent-delete-issue-after-move-it-to-another-project-2' into 'master'

Add service to transfer Group Milestones when transferring a Project

See merge request gitlab-org/gitlab-ce!31778

- Add new service that transfers milestones
from a group to a project
- Include new service in Projects transfer service
- Include FromUnion module in Milestone model
to use in transfer service
- Add specs for new milestones service
- Add specs for transferring milestones in
project transfer service

Use spec_helper for S/MIME settings specs

See merge request gitlab-org/gitlab-ce!32647

Clarified website url precedence

See merge request gitlab-org/gitlab-ce!32599

Cleans up "Scheduling" section on Background Migrations

See merge request gitlab-org/gitlab-ce!32557

Specifies that background migrations should be scheduled as post
deployment migrations

Removed reference to project for DAST

See merge request gitlab-org/gitlab-ce!32601

Backport EE "Track repository pushes as audit events"

See merge request gitlab-org/gitlab-ce!32304

Avoid calling freeze on already frozen strings in app/services

See merge request gitlab-org/gitlab-ce!32635

Add a link to the 'Repository Storage Types' doc page

See merge request gitlab-org/gitlab-ce!32650

Expose epic_iid in issues API (CE-backport)

See merge request gitlab-org/gitlab-ce!32544

(cherry picked from commit 0bf7fecdee5a200eeb4f27b4888a57ceee63bde9)

Add note to gitlab.yml about Service Desk requirement

See merge request gitlab-org/gitlab-ce!32651

Creates base components for new job log

See merge request gitlab-org/gitlab-ce!32543

Creates a link component, a line component and
a clickable line component to handle the
new job log format

Persist `needs:` validation as config error

See merge request gitlab-org/gitlab-ce!32648

Update gitlab-shell to v10.0.0

See merge request gitlab-org/gitlab-ce!32645

Update dependency @gitlab/ui to v5.21.0

See merge request gitlab-org/gitlab-ce!32632

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

Fix outdated comment

See merge request gitlab-org/gitlab-ce!32598