ci: integration: Use 'set +e' in the log collecting job

ci: integration: Use 'set +e' in the log collecting job

All 'script' blocks are defined as 'set -e' and so a single failed
return value means we won't collect some of the logs. Because of
the nature of the original job's failure some of the log sources
might not be available, but that's fine, however, the gitlab
after_script job cannot finish prematurely.

Signed-off-by: Erik Skultety <eskultet@redhat.com>
Reviewed-by: Michal Privoznik <mprivozn@redhat.com>