Ansible 2.16.14 includes a fix for CVE-2024-11079 [1], which results
in the following error:

    jinja2.exceptions.UndefinedError:
        'ansible.vars.hostvars.HostVarsVars
         object' has no attribute 'ansible_host'

This issue occurs because Ansible now includes `localhost` in
`hostvars` without the `ansible_host` variable set, which
unexpectedly breaks our test inventory rendering.

This patch adds a filter to exclude `localhost`
during the rendering process, as it is irrelevant for our purposes.

[1] https://github.com/ansible/ansible/pull/84353

Change-Id: Ie7ae47e5a624da31cf6cc5cd3c9239450487b8ed
(cherry picked from commit 0298699a)