This fixes#9934 and does two things:
1. It registers ESLint as a secondary language server for Vue.js files
(`.vue`)
2. It registers ESLint as a _secondary_ (instead of primary) language
server for TypeScript, JavaScript and TSX.
The second point because I don't see any reason why ESLint should be
registered as a primary language server for these languages. I read
through the code in `project.rs` that uses the primary language server
and I don't think there will be any differences to how it previously
worked.
I also manually tested ESLint support in a Vue.js project, a Next.js
project and a plain old JS project — still works in all three.
Release Notes:
- Added ESLint support for Vue.js files by starting it as a language
server on `.vue` files.
([#9934](https://github.com/zed-industries/zed/issues/9934)).
Thorsten Ball
019821d62c