aws_shell: remove

[cransom]

It appears to have been broken for the last few releases and has had no
upstream updates for the last 2 years. I originally committed this but
didn't add myself to maintainers.

Motivation for this change

Clean out broken packages.

Things done

• Tested using sandboxing (nix.useSandbox on NixOS, or option sandbox in nix.conf on non-NixOS linux)
• Built on platform(s)
  • NixOS
  • macOS
  • other Linux distributions
• Tested via one or more NixOS test(s) if existing and applicable for the change (look inside nixos/tests)
• Tested compilation of all pkgs that depend on this change using nix-shell -p nixpkgs-review --run "nixpkgs-review wip"
• Tested execution of all binary files (usually in ./result/bin/)
• Determined the impact on package closure size (by running nix path-info -S before and after)
• Ensured that relevant documentation is up to date
• Fits CONTRIBUTING.md.

[Mic92]

You removed awscli instead of aws_shell

[cransom]

Wooo oops. I'm sure that was subconcious wishful thinking.