lava: Make the AUM tests logs work again the web UI

Commit 39e6ec4f made tar output the extracted filenames while deployng the overlays and later commit 39e6ec4f made it customizable since the AUM tests do many reboot cycles each with their own (redundant) overlay deployment, causing the logs to grow massively and going over the limits imposed by the LAVA web UI, which refuses to display them and only offers to download them in JSON format.

Unfortunately the fix on 39e6ec4f worked only partially and the overlays in the loop were still upacked in verbose mode, resulting in unreadable logs.

For some reason that currently escapes me related to the way Jinja2 imports work, re-importing the template with the macros from the looping template fixes the issue.

Tasks: T7573