More issues around paused polling

[untitaker]

MessageRejected: null
  File "arroyo/processing/processor.py", line 429, in _run_once
    self.__processing_strategy.submit(message)
  File "sentry/sentry_metrics/consumers/indexer/common.py", line 108, in submit
    raise MessageRejected

AssertionError: null
  File "<frozen runpy>", line 198, in _run_module_as_main
  File "<frozen runpy>", line 88, in _run_code
  File "__main__.py", line 4, in <module>
    main()
  File "sentry/runner/main.py", line 145, in main
    func(**kwargs)
  File "click/core.py", line 1157, in __call__
    return self.main(*args, **kwargs)
  File "click/core.py", line 1078, in main
    rv = self.invoke(ctx)
  File "click/core.py", line 1688, in invoke
    return _process_result(sub_ctx.command.invoke(sub_ctx))
  File "click/core.py", line 1688, in invoke
    return _process_result(sub_ctx.command.invoke(sub_ctx))
  File "click/core.py", line 1434, in invoke
    return ctx.invoke(self.callback, **ctx.params)
  File "click/core.py", line 783, in invoke
    return __callback(*args, **kwargs)
  File "click/decorators.py", line 33, in new_func
    return f(get_current_context(), *args, **kwargs)
  File "sentry/runner/decorators.py", line 82, in inner
    return ctx.invoke(f, *args, **kwargs)
  File "click/core.py", line 783, in invoke
    return __callback(*args, **kwargs)
  File "click/decorators.py", line 33, in new_func
    return f(get_current_context(), *args, **kwargs)
  File "sentry/runner/decorators.py", line 34, in inner
    return ctx.invoke(f, *args, **kwargs)
  File "click/core.py", line 783, in invoke
    return __callback(*args, **kwargs)
  File "sentry/runner/commands/run.py", line 612, in basic_consumer
    run_processor_with_signals(processor, quantized_rebalance_delay_secs)
  File "sentry/utils/kafka.py", line 47, in run_processor_with_signals
    processor.run()
  File "arroyo/processing/processor.py", line 334, in run
    self._run_once()
  File "arroyo/processing/processor.py", line 477, in _run_once
    assert self.__consumer.poll(0.1) is None

https://sentry-st.sentry.io/issues/6578853096/?alert_rule_id=14689092&alert_type=issue&notification_uuid=5596a59d-2264-46d6-8aca-735bef64f485&project=6165734&referrer=slack

arroyo version: 2.21.0