pixi shell-hook outputs batch scripts when running in PowerShell

[melund]

Checks

• I have checked that this issue has not already been reported.

• I have confirmed this bug exists on the latest version of pixi, using pixi --version.

Reproducible example

On windows, in pwsh.exe

pixi shell-hook 

Issue description

On windows in powershell, the command pixi shell-hook outputs batch script instead of the powershell commands.

The documentation seem to indicate that it should detect the shell it is running in.

Also, the shell names are here written in CamelCase, when they should have been lowercase names.

Expected behavior

pixi shell-hook in powershell should output powershell script.