Elm: support elm-language-server executable

[domenkozar]

Check for existing issues

• Completed

Describe the feature

Currently, Elm language extension expects node_modules/@elm-tooling/elm-language-server/out/node/index.js, but it's possible that the project has node_modules in a subfolder like frontend.

To comply with other LSP integrations it would be great if it detected elm-language-server executable first and used it if available.

Environment

Zed 0.162.3

If applicable, add mockups / screenshots to help present your vision of the feature

No response

[domenkozar]

#21097