Disable auto hostname assignment for clients that do not advertise one

### Prerequisites

- [X] I have checked the [Wiki](https://github.com/AdguardTeam/AdGuardHome/wiki) and [Discussions](https://github.com/AdguardTeam/AdGuardHome/discussions) and found no answer

- [X] I have searched other issues and found no duplicates

- [X] I want to request a feature or enhancement and not ask a question

### The problem

With random MAC use, devices do not advertise a hostname to the DHCP server. If the IP of a device is `10.0.0.109`, AGH will assign a hostname of `10-0-0-109.lan`.

This creates an issue where the hostname of the computer changes to this value and creates issues with applications that use the hostname for device identification namely Tailscale.

### Proposed solution

Do not assign hostnames of any kind to devices that do not advertise a hostname.

### Alternatives considered and additional information

_No response_