Revert "fixup! test: enable activity tracking in debug mode." NOT FOR MERGE

This reverts commit f384b68f.

activity tracking impacts performance too much

product/ERP5Type/tests/ERP5TypeTestCase.py

@@ -1028,7 +1028,6 @@ class ERP5TypeCommandLineTestCase(ERP5TypeTestCaseMixin):
       if os.environ.get('erp5_debug_mode'):
         try:
           self.portal.portal_activities.manage_enableActivityTracking()
-          self.commit()
         except AttributeError:
           pass