Some tests golden files were not including the whole results, let's fix
them by increasing the terminal heights.

In this way we can check for them being in golden files in a reliable
way

Add an helper function to check that the golden files contains the final
pam runner results strings.

In this way we can ensure that the golden files sizes are big enough to
hold all the terminal contents.

That's the ubuntu version we're targetting so far, and so we should care
about having it working as expected when doing integration tests in
particular.

When running as root or in a schroot we should not care about chrome
sandbox used by VHS, so let's ignore it.

…olden

These are not needed anymore as the libPAM leaks are fixed in noble

We don't need a docker image anymore now that we're depending on 24.04

Vhs installs chromium for testing, but it may slow downs things a bit if
done during tests (as it may be repeated), while doing it once here
avoids such issue