See !6096.

Issue Board API support

## What does this MR do?

Adds support for Issue Board in the API.

## Are there points in the code the reviewer needs to double check?

~~Double check whether the Issue Board list movement fix is needed.~~ 

*Moved to a separate issue.* [#22890](https://gitlab.com/gitlab-org/gitlab-ce/issues/22890)

## Why was this MR needed?

Currently the API offers partial support to a project's Issue Board indirectly through Labels.
This MR adds support for listing, creating, moving and removing board lists.

## Does this MR meet the acceptance criteria?

- [X] [CHANGELOG](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CHANGELOG) entry added
- [X] [Documentation created/updated](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/doc/development/doc_styleguide.md)
- [X] API support added
- Tests
  - [X] Added for this feature/bug
  - [X] All builds are passing
- [X] Conform by the [merge request performance guides](http://docs.gitlab.com/ce/development/merge_request_performance_guidelines.html)
- [X] Conform by the [style guides](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CONTRIBUTING.md#style-guides)
- [X] Branch has no merge conflicts with `master` (if you do - rebase it please)
- [X] [Squashed related commits together](https://git-scm.com/book/en/Git-Tools-Rewriting-History#Squashing-Commits)

## What are the relevant issue numbers?
[#22195](https://gitlab.com/gitlab-org/gitlab-ce/issues/22195)

See merge request !6646

Document GIT_STRATEGY=none

## What does this MR do?

Adds documentation for the new `GIT_STRATEGY=none` option in GitLab Runner v1.7

## Are there points in the code the reviewer needs to double check?

Speling and grammar, of course.

I'm using the term 'project workspace' to refer to the build directory, which is a Jenkins-ism. Is there preferred alternative wording?

## Why was this MR needed?

Discoverability of new feature

## Screenshots (if relevant)

## Does this MR meet the acceptance criteria?

- <strike>[ ] [CHANGELOG](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CHANGELOG) entry added</strike>
- [x] [Documentation created/updated](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/doc/development/doc_styleguide.md)
- <strike>[ ] API support added</strike>
- <strike>Tests</strike>
  - <strike>[ ] Added for this feature/bug</strike>
  - <strike>[ ] All builds are passing</strike>
- <strike>[ ] Conform by the [merge request performance guides](http://docs.gitlab.com/ce/development/merge_request_performance_guidelines.html)</strike>
- [ ] Conform by the [style guides](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CONTRIBUTING.md#style-guides)
- [x] Branch has no merge conflicts with `master` (if you do - rebase it please)
- [x] [Squashed related commits together](https://git-scm.com/book/en/Git-Tools-Rewriting-History#Squashing-Commits)

## What are the relevant issue numbers?

Closes #21337 

Depends on http://gitlab.com/gitlab-org/gitlab-ci-multi-runner/merge_requests/332

See merge request !6577

Add more info in Cycle Analytics docs

- Clarify the Plan to Code stages in Cycle Analytics docs based on feedback
  https://about.gitlab.com/2016/09/21/cycle-analytics-feature-highlight/#comment-2915715168
- Add a workflow example

See merge request !6562

[ci skip]

[ci skip]

add docs and tests - add additional validation
allow move without content
updated response

  - Includes documentation and tests

Fix small typo in using_docker_images.md, file is called `build_script` (using underscore)

## What does this MR do?

This MR fixes a very small typo in the using_docker_images.md documentation, a space was used in the filename `build_script` while it should be an underscore. Not sure of a MR is the best way to get this changed, trying it anyway :).

## Moving docs to a new location?

No

See merge request !6682