update mocks to reflect new migration

* instead of mocking `created_or_epoch` (which no longer exists)
* .. mock `Unified_Job.has_unpartitioned_events`

awx/main/tests/conftest.py

@@ -3,7 +3,7 @@ import pytest
 from unittest import mock
 from contextlib import contextmanager
 
-from awx.main.models import Credential
+from awx.main.models import Credential, UnifiedJob
 from awx.main.tests.factories import (
     create_organization,
     create_job_template,
@@ -149,3 +149,14 @@ def mock_external_credential_input_sources():
     # test it explicitly.
     with mock.patch.object(Credential, 'dynamic_input_fields', new=[]) as _fixture:
         yield _fixture
+
+
+@pytest.fixture(scope='session', autouse=True)
+def mock_has_unpartitioned_events():
+    # has_unpartitioned_events determines if there are any events still
+    # left in the old, unpartitioned job events table. In order to work,
+    # this method looks up when the partition migration occurred. When
+    # Django's unit tests run, however, there will be no record of the migration.
+    # We mock this out to circumvent the migration query.
+    with mock.patch.object(UnifiedJob, 'has_unpartitioned_events', new=False) as _fixture:
+        yield _fixture

awx/main/tests/functional/api/test_events.py

@@ -1,16 +1,10 @@
 import pytest
-from unittest import mock
 
 from awx.api.versioning import reverse
 from awx.main.models import AdHocCommand, AdHocCommandEvent, JobEvent
 from awx.main.models import Job
 
 
-# Job.created_or_epoch is used to help retrieve events that were
-# created before job event tables were partitioned.
-# This test can safely behave as if all job events were created
-# after the migration, in which case Job.created_or_epoch == Job.created
-@mock.patch('awx.main.models.Job.created_or_epoch', Job.created)
 @pytest.mark.django_db
 @pytest.mark.parametrize(
     'truncate, expected',
@@ -33,11 +27,6 @@ def test_job_events_sublist_truncation(get, organization_factory, job_template_f
     assert (len(response.data['results'][0]['stdout']) == 1025) == expected
 
 
-# Job.created_or_epoch is used to help retrieve events that were
-# created before job event tables were partitioned.
-# This test can safely behave as if all job events were created
-# after the migration, in which case Job.created_or_epoch == Job.created
-@mock.patch('awx.main.models.ad_hoc_commands.AdHocCommand.created_or_epoch', Job.created)
 @pytest.mark.django_db
 @pytest.mark.parametrize(
     'truncate, expected',