LTS Backport: Jackson Cache may hold on to Classloader after pipeline restart

It looks like Jackson has an internal cache which may continue to hold the Flink application classloader through its TypeFactory class. When the pipeline is restarted due to a failure, a new classloader is created which can result in too many classes being loaded.

Reported on the user mailing list: https://lists.apache.org/thread.html/e201891684ef3dcffce48d20d1f9be0e19fc2294334362cc7092c0ff@%3Cuser.beam.apache.org%3E