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The JSON of the example responses were missing a few `,` and therefor
invalid. This adds them to make those JSONs valid.

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

add pipeline ref, sha, and status to the build API response

add tests of build API (pipeline data)

change API documentation for builds API

log change to builds API in CHANGELOG

CHANGELOG: add reference to pull request and contributor's name

This reverts commit 13e37a3e.

* Resolves #18015

- Remove all view related methods from Ci::Build and CommitStatus
- Remove unused Ci::Commit and Ci::Build methods
- Use polymorphism to render different types of CommitStatus

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- Backticks in parameters
- Remove headings
- Fix curl URL link

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Discussion:
https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/2560#note_3742042

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Was PRIVATE_TOKEN but should be PRIVATE-TOKEN.
Underscore vs. kebab-case.