R1:4dc37bcee080

Ignore repository versions on inactive devices in "Repository Servers" panel in Config

Summary:
Fixes T11590. Currently, we incorrectly consider cluster repository versions that are (or were) on devices which are no longer part of the active cluster service when building this status screen.

Instead, ignore them. This is just a display bug; the actual `ClusterEngine` already had similar logic.

Test Plan:
- Added a bad leader record to `repository_workingcopyversion`.
- Before patch, got a bad…