* tests based on jetty-runner do not work because
the jetty-runner JAR contains invalid Java SPI services config files
* due to these invalid files Jetty 11.0.20+ is unable to properly
initialize itself itself
* This change removes all tests based on jetty-runner
and bumps the Jetty version to 11.0.24
* There are already jobs using the Jetty Maven plugin to
launch a testing instance + run all tests
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