API: Respect the 'If-Unmodified-Since' for delete endpoints
What does this MR do?
Respect the If-Unmodified-Since header when deleting a resource via the API. When passing the header and the resource was updated meanwhile, a 412 error is raised.
However, this cannot be implemented for all endpoints because not every resource has an updated_at field. This includes:
- Branches
- Tags
- Variables
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
What are the relevant issue numbers?
Edited by username-removed-2900