Add cleanup of ThreadLocal for reusable threads from the pool. #1582
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ThreadLocal variable is used in Saturn RequestContext to store user IRI within a thread.
When using thread pools the threads are reused, so the user IRI used previously for a thread was preserved and was reused for a different request and often different user, causing invalid request user being handled.
This PR adds ThreadLocal variables cleanup before each new request using request filters.
See: https://www.baeldung.com/java-threadlocal#threadlocalsand-thread-pools