Feature: Ubuntu 22 Support

### Is there an existing request for this feature?

- [X] I have searched the existing issues and found none that matched mine

### Describe the feature

Ubuntu 22 support. Intune still doesn't support Ubuntu 24 and Ubuntu 22 still needs to be used until Ubuntu 24 support is rolled out for Intune.

### Describe the ideal solution

PPA repo has Ubuntu 22 packages that will work similarly to how it configured on Ubuntu 24.

### Alternatives and current workarounds

_No response_

### System information and logs

### Environment
* broker version: please run `snap info authd-msentraid`
* authd version: please run `/usr/libexec/authd version`
* gnome shell version: please run `apt policy gnome-shell`
* Distribution: (**NAME** in `/etc/os-release`)
* Distribution version: (**VERSION_ID** on `/etc/os-release`):

### Log files
Please redact/remove sensitive information:

#### Authd entries:

```raw
journalctl -u authd.service
```

#### MS Entra ID broker entries:

```raw
journalctl -u snap.authd-msentraid.authd-msentraid.service
```

### Application settings

Please redact/remove sensitive information:

#### Broker configuration:

```raw
cat /var/snap/authd-msentraid/current/broker.conf
```

#### Broker authd configuration:

```raw
cat /etc/authd/brokers.d/msentraid.conf
```

### Relevant information

_No response_

### Double check your logs

- [X] I have redacted any sensitive information from the logs

Start by inspecting how the PPA and Ubuntu 24 packages are configured, then compare the reported values from `snap info authd-msentraid`, `/usr/libexec/authd version`, `apt policy gnome-shell`, and `/etc/os-release` on Ubuntu 22. Done means Ubuntu 22 packages are available from the PPA and work similarly to the Ubuntu 24 setup.

Written by the indexing model from the issue text.