Disable `csharp-ls` by default (#58507)

In preparation for https://github.com/zed-extensions/csharp/pull/77

Release Notes:

- N/A
20f784e189Finn Evers committed on 6/4/2026, 7:31:41 AM· committed by GitHubparentea7b4c7
1 file changedLine totals unavailable