[Feature]: Cross-project SSH fleet sharing #3626
Description
Problem
It is not possible to share SSH instances across multiple dstack projects.
Solution
https://docs.google.com/document/d/1kU4eQDXZz9ovQ-1V6etrV6wSuIhm-wC9cwqz6hUgeCQ
Implementation plan
- Submitting jobs to imported fleets
- Viewing imported fleets in API, CLI, UI
- Filtering events by imported fleets and instances
- Exports API
- Exports CLI
- Exports UI
- Imports API
- Imports CLI
- Imports UI
- Evicting jobs if fleet is no longer imported
- Referencing imported fleets in CLI and run configurations using
<project>/<fleet>syntax - Removing fleets from exports on deletion
- (?) Resource export / import events
- Docs