Non-deterministic behavior when there are multiple parent folders with .luarc.json.

まだ誰も着手していません。

### How are you using the lua-language-server?

NeoVim

### Which OS are you using?

Linux

### What is the issue affecting?

Diagnostics/Syntax Checking

### Expected Behaviour

When the language server processes a Lua file, it should use the .luarc.json file that is closest (in the chain of parent folders) to the file being opened. So in this case:
```
dir1
|- .luarc.json
\_ dir2
|- .luarc.json
\_ code.lua
```
Opening code.lua should use dir2/.luarc.json.

### Actual Behaviour

Non-deterministic behavior: sometimes it uses dir1/.luarc.json and sometimes it uses dir2/.luarc.json. This is a big problem e.g. in cases where those two files specify different versions of Lua.

### Reproduction steps

Create the directory/file structure above, specifying different version of Lua in each one, then put some code in code.lua that is sensitive to the version, then run lua-language-server (I run it through Neovim) on code.lua, and observe sometimes it assumes one version of Lua and other times it uses the other.

Deleting dir1/.luarc.json then eliminates the non-deterministic behavior and it always uses dir2/.luarc.json.

### Additional Notes

_No response_

### Log File

_No response_

まず、2つの .luarc.json ファイルを含むディレクトリ構造を再現し、Neovim で code.lua を開きます。lua-language-server が設定ファイルをどのように検出するかを追跡し、異なる Lua バージョンを設定した状態で繰り返し実行した結果を比較します。最も近い親ディレクトリの設定が一貫して選択され、再現時に非決定的な診断が表示されなくなれば完了です。

索引モデルが issue の本文から書いたものです。