ionic cap copy --no-build --watch not working

`ionic cap copy --no-build --watch`
expected behavior keep running and copy files to ios, android, web at file change
actual runs once

before I need to develop for ios I just run this command and open native ide
`ionic capacitor run ios -l --external`
so after file change I just

1. need to click run app button in xcode

but now I'm adding feature to connect to iot WiFi Access Point therefore
I can't use `ionic capacitor run ios -l --external` cause it need my ios device to be connected to the same network as my computer to work properly and get livereloads

So after every file change I need to

1. run `ionic build --watch` for file changes
2. then after every change manually run `ionic cap copy --no-build --watch` (--watch not working as expected run once)
3. then in xcode run app button

首先跟踪 `ionic cap copy` 命令及其对 `--watch` 的处理，然后在修改文件的同时复现 `ionic cap copy --no-build --watch`。完成的标准是命令保持运行，并将更改复制到 iOS、Android 和 web 目标，而不是在完成一次复制后退出。

由索引模型根据 Issue 内容生成。