bug: Live Reload not working when changing .css files to .scss

# Bug Report

**Ionic version:**

[ ] **4.x**
[x] **5.x**
[ ] **6.x**

**Current behavior:**

If I change the .css extension with .scss then the live reloading freeze in Compiling... (if I close the app and serve again the issue still persist)
**Expected behavior:**

Everything works normaly
**Steps to reproduce:**

Install node-sass and then change at least 1 .css file to .scss

**Ionic info:**

```
Ionic:

Ionic CLI : 6.16.3 (C:\Users\PC\AppData\Roaming\npm\node_modules\@ionic\cli)
Ionic Framework : @ionic/react 5.6.10

Capacitor:

Capacitor CLI : 3.0.2
@capacitor/android : not installed
@capacitor/core : 3.0.2
@capacitor/ios : not installed

Utility:

cordova-res : 0.15.1
native-run : 1.4.0

System:

NodeJS : v14.15.0 (C:\Program Files\nodejs\node.exe)
npm : 6.14.8
OS : Windows 10
```

首先，在安裝 node-sass 並將 CSS 檔案重新命名為 SCSS 後，使用回報的 Node.js 和 Windows 設定，重現 Ionic CLI 6.16.3 中 live-reload 卡住的問題。追蹤 CLI 的 live-reload 編譯路徑，並確認 SCSS 變更能正常編譯和重新載入，而不會一直卡在 Compiling....

由索引模型根據 Issue 內容生成。