User/Group keys with dashes not included in schema

# Bug report

Due to some [unfortunate old code](https://github.com/canonical/cloud-init/blob/9bcb3dce9d7abfbb7273e313d5056eda0424108f/cloudinit/distros/ug_util.py#L114), every users/groups key in our user data allows for both underscores and dashes. For example, if we define the key as `ssh_authorized_keys`, then `ssh-authorized-keys` is also valid.

The schema for all of the [user and group properties](https://github.com/canonical/cloud-init/blob/9bcb3dce9d7abfbb7273e313d5056eda0424108f/cloudinit/config/schemas/schema-cloud-config-v1.json#L213) contains the `_` version of the key but not the `-` version. The schema needs to be updated to allow both while specifying that the `-` version is deprecated.

https://github.com/canonical/cloud-init/pull/5162 already does this for `ssh-authorized-keys`, but we should do it for the remaining keys to be consistent.