* Tests support for ubuntu core 22 in arm architecture
This change includes the bits needed to run ubuntu-core in arm devices
and also the nested tests.
A new backend is added google-nested-arm.
Changes in tests to support the new system are also included.
* skip removing test-snapd-arm-tools
this is not needed anymore as focal is not being supported
* Use host machine for arch
* tests fixes
* skip nested arm xecution in github workflow
0078bb08f5