snapd should depend (!=recommend) on fuse3 for snaps in containers

https://github.com/snapcore/snapd/pull/11600 added a Depends on fuse3 to make `snap install` possible inside LXD containers. This was modified by https://github.com/snapcore/snapd/pull/11648 to have fuse3 as a Recommends only.

With minimal images, Recommends are no longer installed by default meaning that you cannot install any snap without first installing fuse3:

```
$ lxc launch ubuntu-minimal-daily:24.04 c1
$ lxc exec c1 -- systemctl is-system-running --wait --quiet
$ lxc exec c1 -- snap install lxd
error: system does not fully support snapd: The "fuse" filesystem is required on this system but
       not available. Please try to install the fuse package.

$ lxc exec c1 -- apt-cache show snapd | grep Recommends
Recommends: gnupg, fuse3 (>= 3.10.5-1) | fuse
```