[Tei-council] Stylesheets Test2 job on Jenkins

Hi Martin and Council, at yesterday's Council meeting we decided to push your Test2 forward and run both test suites in parallel for some time to see whether they fail/succeed for the same issues. If this runs smooth, we might remove the original tests completely at some point. Syd was so kind to add a new „Test2“ target to the Makefile [1] and I set up a new job at the Paderborn Jenkins [2]. It simply runs `make clean test2` (so no artifacts are built). I had to update the `tei-log-parse-rules` and now everything seems to work nicely. Cheers Peter [1] https://github.com/TEIC/Stylesheets/commit/c8a8f6fbc0ff98c47041fc365a98f6d55... [2] https://jenkins.tei-c.org/job/Stylesheets-dev-Test2/