CI: format cirrus logs

This introduces a new cirrus helper script, logformatter.
Usage is:

    [commands...] | logformatter TEST-NAME

It reformats its input into a readable, highlighed, linkable
form. Some features:

   - boring stuff (timestamps, standard podman options) is
     deemphasized
   - important stuff (warnings, errors) is emphasized
   - in-page links to the actual failures
   - active links to source files
   - jumps to bottom of page on load, because that's where
     the errors are. (All errors are linked)

Add it to select test commands (integration, system) and
add a new artifacts_html, run in the 'always' block, which
uploads generated *.log.html into Cirrus; from there we
generate a live URL that can be viewed in browser.

Unfortunately, due to security concerns in Cirrus, it is
not currently possible to make the link a live one.

Kludge: add a line of dashes after Restoring images; without this,
the first test ("systemd PID 1") has no dashes before it, so
logformatter doesn't see it.

Signed-off-by: Ed Santiago <santiago@redhat.com>

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