Remove Inventory Source for "Template additional groups and hostvars at runtime" option

[tvo318]

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Bug Summary

We should remove the top option from the Source picklist of the Inventory form:

See conversation here: https://redhat-internal.slack.com/archives/C0H0TG8CV/p1709916496872759?thread_ts=1709820007.243199&cid=C0H0TG8CV

AWX version

latest

Select the relevant components

• UI
• UI (tech preview)
• API
• Docs
• Collection
• CLI
• Other

Installation method

kubernetes

Modifications

no

Ansible version

No response

Operating system

No response

Web browser

Chrome

Steps to reproduce

1. In the inventory you want to add a source, click the Sources tab.
2. Click the Add button.
   This opens the Create Source window.
3. In the Source field, choose a source.

Expected results

The picklist from the Source field should not have the Template additional groups and hostvars at runtime option.

Actual results

The picklist from the Source field has the Template additional groups and hostvars at runtime option.

Additional information

Initially, we thought it was for constructed inventory but it doesn't make sense to have it there.
See the Slack conversation: https://redhat-internal.slack.com/archives/C0H0TG8CV/p1709820007243199