Closes #50631 Before you mark this PR as ready for review, make sure that you have: - [x] Added a solid test coverage and/or screenshots from doing manual testing - [x] Done a self-review taking into account security and performance aspects - [ ] Aligned any UI changes with the [UI checklist](https://github.com/zed-industries/zed/blob/main/CONTRIBUTING.md#uiux-checklist) Release Notes: - Fixed `formatter: "auto"` silently doing nothing when the first language server for a language doesn't support formatting (e.g., Dependi before Tombi for TOML).