GitLab CLI available in all CI runners

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Problem to Solve

Currently to use the GitLab CLI in a CI Job, users need to find the appropriate package for the image they're using, install the CLI, and then configure it before they're able to interact or perform any commands. Because of this we see:

1. Longer job run times because we need to spend time setting things up, just to do what we want
2. Challenges in configuring and setting up the GitLab CLI for these non-interactive use cases (cli#1236)

Proposal

We should make the GitLab CLI available to all executors/runners by default. Users should be able to run any commands in the CLI as long as they've configured the appropriate (yet to exist) variable for authentication