Pixi global uninstall should not early out on non existent environment. #4562
Description
When running the uninstall of a long list of items I don't want Pixi to half execute my command. e.g.
pixi global uninstall git gh nvim ipython btop bat ripgrep
✔ Removed environment git.
✔ Removed environment gh.
✔ Removed environment nvim.
Error: × Couldn't remove ipython
╰─▶ Environment ipython doesn't exist.
Half of my environments are now gone, so it takes me effort to rewrite the command correctly.
I would like Pixi to continue the uninstallation and then print an error about the missing environments.