fix tests, add pagination tests

* job_created is a fake field as far as Django is concerned. Under the
hood, in postgres, this is the partition key so it is real. sqlite
doesn't support partitioning so we need to fake some things.
Specifically, we need to remove job_created from being auto-added to
get_event_queryset()
* Add pagination tests for <unified_job_name>/<id>/<job_events>?limit=x
endpoint to make sure the paginator is wired up.

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

@@ -4,6 +4,7 @@ from unittest.mock import patch
 from urllib.parse import urlencode
 
 from awx.main.models.inventory import Group, Host
+from awx.main.models.ad_hoc_commands import AdHocCommand
 from awx.api.pagination import Pagination
 from awx.api.versioning import reverse
 
@@ -61,3 +62,46 @@ def test_pagination_cap_page_size(get, admin, inventory):
 
         assert jdata['previous'] == host_list_url({'page': '1', 'page_size': '5'})
         assert jdata['next'] == host_list_url({'page': '3', 'page_size': '5'})
+
+
+class TestUnifiedJobEventPagination:
+    @pytest.fixture
+    def ad_hoc_command(self, ad_hoc_command_factory):
+        return ad_hoc_command_factory()
+
+    def _test_unified_job(self, get, admin, template, job_attribute, list_endpoint):
+        if isinstance(template, AdHocCommand):
+            job = template
+        else:
+            job = template.create_unified_job()
+        kwargs = {job_attribute: job.pk}
+        for i in range(20):
+            job.event_class.create_from_data(**kwargs).save()
+
+        url = reverse(f'api:{list_endpoint}', kwargs={'pk': job.pk}) + '?limit=7'
+        resp = get(url, user=admin, expect=200)
+
+        assert 'count' not in resp.data
+        assert 'next' not in resp.data
+        assert 'previous' not in resp.data
+        assert len(resp.data['results']) == 7
+
+    @pytest.mark.django_db
+    def test_job(self, get, admin, job_template):
+        self._test_unified_job(get, admin, job_template, 'job_id', 'job_job_events_list')
+
+    @pytest.mark.django_db
+    def test_project_update(self, get, admin, project):
+        self._test_unified_job(get, admin, project, 'project_update_id', 'project_update_events_list')
+
+    @pytest.mark.django_db
+    def test_inventory_update(self, get, admin, inventory_source):
+        self._test_unified_job(get, admin, inventory_source, 'inventory_update_id', 'inventory_update_events_list')
+
+    @pytest.mark.django_db
+    def test_system_job(self, get, admin, system_job_template):
+        self._test_unified_job(get, admin, system_job_template, 'system_job_id', 'system_job_events_list')
+
+    @pytest.mark.django_db
+    def test_adhoc_command(self, get, admin, ad_hoc_command):
+        self._test_unified_job(get, admin, ad_hoc_command, 'ad_hoc_command_id', 'ad_hoc_command_ad_hoc_command_events_list')