Creates CI Header component to use in pipelines and job details pages
What does this MR do?
Creates a reusable shared component between pipeline's details page and job's detail page.
The original MR is https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/11340, this is just a port in order to merge it into master directly.
Why was this MR needed?
The goal is to make both pipeline's details page and job's detail page realtime. This header is shared between them.
Screenshots (if relevant)
Does this MR meet the acceptance criteria?
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Changelog entry added, if necessary - Tests
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Added for this feature/bug -
All builds are passing
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Conform by the merge request performance guides -
Conform by the style guides -
Branch has no merge conflicts with master(if it does - rebase it please) -
Squashed related commits together