[FR]: Support for non-Flatpak VSCode (and its variants)

### What Happened

Currently, the included VSCode bridge Flatpak-packaged versions of VSCode. Host or Snap variants were not supported.

### How to Reproduce

I've tried a basic launch script of

```bash
flatpak-spawn --host code "$@"
```

Basic editing works but I haven't tested debugging

The above is also capable of launching Snap's VSCode binary as well.

### Operating System

_No response_

### Command-line output

```shell

```

### Anything else?

_No response_

提案されている `flatpak-spawn --host code "$@"` 起動スクリプトから始め、既存の VSCode ブリッジと動作を比較します。UnityHub から Host 版と Snap 版の VSCode が正常に起動し、基本的な編集とデバッグの両方がテストされれば完了です。

索引モデルが issue の本文から書いたものです。