[az][cli_tests] Tests fail when all AZ have been disabled

**Describe the bug**
I launched the CLI tests on my machine, and saw that they were almost all failing. Its only at the end when I got the full result that I understood that it was because I had disabled all the AZ earlier.

**To Reproduce**
1. Disable all zones.
2. Launch the CLI tests.
3. Notice how most of them fail.

**Expected behavior**
Either there should be a fail fast (like before actually launching the tests, if the AZ are disabled, it should ask the user to enable them first) or the tests should pre-emptively enable the zones if they require them.

**Logs**
Please provide logs from the daemon, see [Access logs](https://canonical.com/multipass/docs/stable/how-to-guides/troubleshoot/access-logs/) on where to find them on your platform.

**Additional info**
- OS: Win 11 Pro
- CPU architecture or model: x64
- `multipass version`
multipass 1.17.0-dev.ci6331+ga58dcf2e.win
multipassd 1.17.0-dev.ci6331+ga58dcf2e.win

**Additional context**
Add any other context about the problem here.

Start by running the CLI tests with all availability zones disabled and inspect which tests fail and where zone availability is checked. The work is complete when the test run either stops early with a clear request to enable zones or pre-emptively enables the required zones, with the affected tests passing.

Written by the indexing model from the issue text.