Follow-up of https://github.com/zed-industries/zed/pull/2991 improving
rough edges around supplementary LSP servers:

* Fixes
https://zed-industries.slack.com/archives/C04S6T1T7TQ/p1695281196667609
Copilot init panic
* Makes LSP server list scrollable in the panel
* Shows supplementary servers' RPC logs in the panel

Release Notes:

- N/A