WIP: API return 204 on delete
What does this MR do?
Let delete endpoints return 204
with no content.
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Changelog entry added -
Documentation created/updated -
API support added - Tests
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All builds are passing
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Conform by the merge request performance guides -
Conform by the style guides
What are the relevant issue numbers?
Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/20429. Related to https://gitlab.com/gitlab-org/gitlab-ce/issues/20070