Fix ZSH environment in non-login non-interactive shells

What does this MR do?

If the shell is non-login non-interactive, like when the runner sends a command with SSH, it will not load .zshrc, .zprofile, /etc/zshrc and /etc/zprofile. Only .zshenv.

This makes sure that we properly setup our $PATH and load our .zshrc when executing commands.

Also it sets LANG and LC_ALL to fix Warning: the environment variable LANG is not set! in https://gitlab.com/gitlab-org/ci-cd/shared-runners/images/macstadium/orka/-/jobs/1094034917#L57

From https://unix.stackexchange.com/questions/537637/sshing-into-system-with-zsh-as-default-shell-doesnt-run-etc-profile

Why was this MR needed?

What's the best way to test this MR?

Before:

ssh -o Port=8826 gitlab@10.221.188.127
Loading .zshenv
Loading /etc/zprofile
Loading .zprofile
Loading /etc/zshrc
Loading .zshrc
gitlab@Gitlabs-iPro ~ % printenv
...
PATH=/Users/gitlab/.asdf/shims:/Users/gitlab/.asdf/bin:/usr/local/bin:/usr/bin:/bin:/usr/sbin:/sbin:/Library/Apple/usr/bin
...

ssh -o Port=8826 gitlab@10.221.188.127 printenv
Loading .zshenv
...
PATH=/usr/bin:/bin:/usr/sbin:/sbin
...

After:

ssh -o Port=8826 gitlab@10.221.188.127
Loading .zshenv
Loading /etc/zprofile
Loading .zprofile
Loading /etc/zshrc
Loading .zshrc
gitlab@Gitlabs-iPro ~ % printenv
...
PATH=/Users/gitlab/.asdf/shims:/Users/gitlab/.asdf/bin:/usr/local/bin:/usr/bin:/bin:/usr/sbin:/sbin:/Library/Apple/usr/bin
...

ssh -o Port=8826 gitlab@10.221.188.127 printenv
Loading .zshenv
Loading .zshrc
...
PATH=/Users/gitlab/.asdf/shims:/Users/gitlab/.asdf/bin:/usr/local/bin:/usr/bin:/bin:/usr/sbin:/sbin:/Library/Apple/usr/bin
...

What are the relevant issue numbers?

Closes #70 (closed)