Stop testing on the host as this causes problems on our CI

[ktsakalozos]

Summary

This comes up on our AWS instances on ARM64. We also see this on strict deployments:

Setup snap "microceph" aliases                                             
error: cannot perform the following tasks:
[release-microk8s-arm64] - Run install hook of "microceph" snap if present (run hook "install": cannot create symbolic link "/tmp/snap.rootfs_YEesS5/bin": Permission denied)

Disabling the testing on the host.