fix: ts/js LSPs require lockfile

[fuegoio]

Trying to fix #4015.

As stated in my last comment here, my root_dir manoeuver was only made to improve support for all projects, not only monorepos. I thought every project using TS / Eslint would have a lock file as you need Eslint to be installed somewhere, but there are global installations as well (different from the LSP installation be careful here!).

In this case, I propose that we fallback to the current directory instead, as it means that the TS / Eslint / Biome / ... version is the same and we can reuse the same instance for all files that we open through this nvim process.

I also leveraged nvim priority list to add the .git for project roots, I removed it in my original PR because it was making false positives with lock files.