Remove github actions job for pack-cli arch package

[anjannath]

Summary

The pack-cli package has been adopted by the arch linux extra repository: https://archlinux.org/packages/extra/x86_64/pack-cli/ and hence the namespace has been removed from aur

this PR removes the github actions job that was building and pushing the package to aur

Output

Before

After

Documentation

• Should this change be documented?
  • Yes, see Update pack-cli install instructions for arch linux docs#726 (documentation can be updated with pacman command to install pack-cli instead of using package from aur
  • No

Related

Resolves #2181

[jjbustamante]

Thank you very much @anjannath