WIP: Introduce a new API v4 for pipeline triggers
What does this MR do?
This MR is a first one for solving https://gitlab.com/gitlab-org/gitlab-ce/issues/27156. It introduces a new api/v4 trigger pipeline request.
I do also remove and migrate trigger_requests into ci_commits table, making it much easier to discover that pipeline got triggered.
This is draft and still a lot of to be done.
@grzesiek Any thought about implementation and migration?
Are there points in the code the reviewer needs to double check?
Why was this MR needed?
Screenshots (if relevant)
Does this MR meet the acceptance criteria?
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Changelog entry added -
Documentation created/updated -
API support added - 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