powershell completion doesn't work

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### What were you expecting to happen?

powershell completion to work

### What actually happened?

powershell completion didn't work (tab does nothing after running the documented command)

### Please provide the following information:
* OS & version [e.g. MacOS Catalina 10.15.4]:
* node version (run `node -v`):
* npm version (run `npm -v`):
* gulp version (run `gulp -v`):

### Additional information

The completion script was written more than 8 years ago and is probably very outdated (if it ever worked; googling "nativeargumentcompleters" yields a very low amount and no official documentation).

It should probably be using the following to support newer powershell
https://learn.microsoft.com/en-us/powershell/module/microsoft.powershell.core/register-argumentcompleter?view=powershell-7.5