[Bug]: Adding on-prem node/instance to two different fleets shouldn't be allowed

[james-boydell]

Steps to reproduce

Create a fleet with an on-prem node/instance. Change the name of the fleet in the config and apply. The on-prem node will now be a part of two different fleets.

Actual behaviour

No response

Expected behaviour

When adding a node/instance to a fleet, it should check if that node/instance is already part of a fleet

dstack version

0.18.13 and 0.18.14rc1

Server logs

No response

Additional information

No response

[github-actions[bot]]

This issue is stale because it has been open for 30 days with no activity.

[r4victor]

Closed by #1938