[Feature] Run CI on ARM runners too

[alessandrofelder]

Is your feature request related to a problem? Please describe.
We have no CI guarantee that BrainGlobe installs well on ARM Macs.

Describe the solution you'd like
We should run at least the test for the metapackage and the workflows on ARM CI too?

Describe alternatives you've considered
A clear and concise description of any alternative solutions or features you've considered.

Additional context
https://github.blog/changelog/2024-01-30-github-actions-introducing-the-new-m1-macos-runner-available-to-open-source/

[adamltyson]

@alessandrofelder I think this is done now right?

[alessandrofelder]

Yes 🎉