use `hostnamectl` instead of `hostname`

**Is your feature request related to a problem? Please describe.**

`hostname` is not installed by default on RHEL 10. It can be installed with `sudo dnf install hostname`. `hostnamectl hostname` is available by default. It would be great it we could use `hostnamectl` instead.

**Describe the solution you'd like**
Do not require the installation of the `hostname` package.

No file or test is named. Search the repository's deployment and configuration code for uses of `hostname`, then inspect the surrounding task or command entry point. Done means the implementation uses `hostnamectl` and no longer requires the `hostname` package on RHEL 10.

Written by the indexing model from the issue text.