fix(pp-threadpool): the workaround for a stuck tests001 in CI (#2931)

CI ocassionaly stuck running test001 b/c PP threadpool endlessly reschedules
    meta jobs, e.g. BATCH_PRIMITIVE_CREATE, which ByteStreams were somehow damaged or read out.

Co-authored-by: Leonid Fedorov <leonid.fedorov@mariadb.com>

utils/threadpool/fair_threadpool.cpp

@@ -228,6 +228,7 @@ void FairThreadPool::threadFcn(const PriorityThreadPool::Priority preferredQueue
       {
         // to avoid excessive CPU usage waiting for data from storage
         usleep(500);
+        runList[0].weight_ += RescheduleWeightIncrement;
         addJob(runList[0]);
       }
     }