extension_host: Include more details about error messages (#30543)

This PR makes it so the error messages surfaced to extensions will
contain more information.

Supersedes https://github.com/zed-industries/zed/pull/28491.

Release Notes:

- N/A
58ed81b698Marshall Bowers committed on 5/12/2025, 9:21:37 AM· committed by GitHubparent83319c8
1 file changedLine totals unavailable