Summary:
When provisioning Ubuntu using the "Preseed Autoinstall cloud-init user data" template, the `time-zone` value configured via Host Group Parameters or Host Parameters is not reflected in the installed system. The same `time-zone` parameter is correctly applied when provisioning via Kickstart templates.

Description:
We configure `time-zone` (e.g. `Asia/Tokyo`) either on:

• Host Group Parameters: Configure -> Host Groups -> <target group> -> Parameters tab
  or
• Host Parameters: Hosts -> All Hosts -> <target host> -> Parameters tab

During provisioning of Ubuntu (Autoinstall / cloud-init based), the installed OS timezone remains the default (e.g. `Etc/UTC`) or is not set as expected.

This appears to be because the Ubuntu Autoinstall user-data template does not consume the `time-zone` parameter. In contrast, Kickstart provisioning does apply the same parameter correctly in our environment.

Steps to Reproduce:
1. Set the timezone parameter in Foreman WebUI using either of the following:

• A) Host Group Parameter:
  • Navigate to: Configure -> Host Groups -> <target group> -> Parameters tab
  • Add parameter:
    • Name: time-zone
    • Value: Asia/Tokyo (or any valid timezone)
• B) Host Parameter:
  • Navigate to: Hosts -> All Hosts -> <target host> -> Parameters tab
  • Add parameter:
    • Name: time-zone
    • Value: Asia/Tokyo (or any valid timezone)

2. Create/select an Ubuntu host that provisions via Autoinstall (cloud-init user-data) and uses:

• Provisioning template: Preseed Autoinstall cloud-init user data

3. Start provisioning.

4. After installation completes, check the timezone on the provisioned host (e.g. `timedatectl`).

Actual Behavior:
The installed host does not reflect `time-zone` from Host Group / Host parameters (often remains `Etc/UTC` or a default).

Expected Behavior:
Ubuntu Autoinstall provisioning should apply `time-zone` from Host Group / Host parameters, similarly to Kickstart provisioning.