Use self hosted arm64 runners

[jpm-canonical]

Summary

The self hosted runners are cheaper and faster. We should ideally use them.

Warning
The workflow fails when running on self hosted runners.

2024/12/13 06:52:01 Removing installed snap: false
2024/12/13 06:52:01 Failed to setup tests: failed to get mock gpio chip number: failed to get mock gpio chip number, Error ls: cannot access '/dev/gpiochip*': No such file or directory
: %!s(<nil>)
exit status 1
FAIL	matter-pi-gpio-commander-tests	32.368s

Related issues

Testing steps

[jpm-canonical]

We are now also getting this failure/error with the Github hosted runners:
https://github.com/canonical/matter-pi-gpio-commander/actions/runs/12625674805/job/35177923945