Add a `remote_mirrors` project API
Allows querying the API for the status of a project's remote mirrors.
As mirroring is becoming an even more critical part of our workflow via gitlab-com/gl-infra/delivery#584 (closed), it will be helpful to add additional monitoring and alerting for the mirror statuses.
#38121 (closed) tracks removal of the feature flag.
TODO:
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Create issue to remove feature flag, add to code comment -
API for triggering a sync (follow-up MR)? -
GraphQL (follow-up MR)?