pixi autocompletions: compdef undefined on zsh

[wolfv]

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

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Issue description

I sat next to someone trying out pixi and after running the install, starting zsh said compdef undefined.

I think this might be an issue in our autocompletion code - removing autocompletions solved it.

Expected behavior

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[ruben-arts]

Not sure if we should fix this our that the user should update its installation:
This would fix it for them. https://unix.stackexchange.com/a/477909

We could also change the behavior for zsh so that it puts the completions in a file and add that file to the $fpath But that is a little more steps to update that file when the pixi version changes.
clap-rs/clap#2479 (comment)