ProcessingNodeTestCase: also setRequest in processing_node

This is done on the process running test (by
ERP5TypeTestCaseRequestConnection) and when using timerserver loop (by
TimerServer which calls publish_module), but this was never set in
processing_node.

Before 3b874e49 (ERP5Type/tests: review requests in tests, 2023-04-19)
getRequest could find a request anyway, because the test pached
getRequest to find a request from the app, but after this change
executing activities in an instance running with runUnitTest without
test specified failed with:

    Module importlib, line 37, in import_module
      __import__(name)
    Module Products.ERP5Type.dynamic.component_package, line 412, in load_module
      return self.__load_module(fullname)
    Module Products.ERP5Type.dynamic.component_package, line 379, in __load_module
      erp5.component.ref_manager.add_module(module)
    Module Products.ERP5Type.dynamic.dynamic_module, line 75, in add_module
      self.add_request(get_request())
    Module Products.ERP5Type.dynamic.dynamic_module, line 53, in add_request
      self.setdefault(last_sync, (WeakSet(), set()))[0].add(request_obj)
    Module _weakrefset, line 86, in add
      self.data.add(ref(item, self._remove))
  TypeError: cannot create weak reference to 'NoneType' object

( maybe we remove processing_node and use only timerserver, these two
methods are more or less equivalent for simple cases and timerserver is
closer to what a "real" zope does )
12 jobs for for_testrunner_1 in 0 seconds
Status Job ID Name Coverage
  External
passed ERP5.CodingStyleTest-Master

01:05:21

passed ERP5.CodingStyleTest-TestRunner1

01:01:13

passed ERP5.PerformanceTest-Master

00:26:55

passed ERP5.PerformanceTest-TestRunner1

00:26:46

failed ERP5.UnitTest-Master

01:28:25

failed ERP5.UnitTest-TestRunner1

02:03:56

failed ERP5.UnitTest-Zope2

04:07:58

failed ERP5.UnitTest-Zope2-ForTestRunner1

02:01:01

passed SlapOS.Eggs.UnitTest-Master.Python2

00:14:29

passed SlapOS.Eggs.UnitTest-Master.Python3

00:14:39

passed Wendelin.UnitTest-Master

00:28:43

failed Wendelin.UnitTest-Master

00:39:04