Allow triggering prune from projects API
What does this MR do and why?
We added the ability to trigger a prune of unreachable objects to the web UI recently (!105584 (merged))
This MR is to allow the same thing via the API
MR acceptance checklist
This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.
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I have evaluated the MR acceptance checklist for this MR.
Related to #391499 (closed)
Edited by Jerry Seto