Update runner managers owned by non-existing projects
What does this MR do and why?
This MR follows up on !176879 (merged) and adds a background migration to handle runner managers for runners that are owned by deleted projects (referenced through sharding_key_id in ci_runner_machines). There will be similar MRs to handle runners and runner taggings. If there is a fallback project association, we use the oldest still-existing association, otherwise we delete the runner manager.
Update runner managers owned by non-existing projects
Set sharding_key_id with fallback owner, or remove record if no fallback
exists.
Changelog: added
References
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- Handle sharding_key_id pointing to missing proj... (#512075 - closed)
- Update runners owned by non-existing projects (!177271 - merged)
- Update runner taggings owned by non-existing pr... (!177453 - merged)
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