Remove remaining plugin-related language server adapters (#34334)

Follow-up of https://github.com/zed-industries/zed/pull/34208

Release Notes:

- N/A
e070c81687Kirill Bulatov committed on 7/12/2025, 11:42:14 AM· committed by GitHubparent5b61b8c
1 file changedLine totals unavailable