Replace git shallow clone with shutil.copytree

Introduce build_project_dir method
  the base method will create an empty project dir for workdir

Share code between job and inventory tasks with new mixin
  combine rest of pre_run_hook logic
  structure to hold lock for entire sync process

force sync to run for inventory updates due to UI issues

Remove reference to removed scm_last_revision field

awx/main/tests/unit/test_tasks.py

@@ -472,7 +472,7 @@ class TestGenericRun:
         task.model.objects.get = mock.Mock(return_value=job)
         task.build_private_data_files = mock.Mock(side_effect=OSError())
 
-        with mock.patch('awx.main.tasks.jobs.copy_tree'):
+        with mock.patch('awx.main.tasks.jobs.shutil.copytree'):
             with pytest.raises(Exception):
                 task.run(1)
 
@@ -494,7 +494,7 @@ class TestGenericRun:
         task.model.objects.get = mock.Mock(return_value=job)
         task.build_private_data_files = mock.Mock()
 
-        with mock.patch('awx.main.tasks.jobs.copy_tree'):
+        with mock.patch('awx.main.tasks.jobs.shutil.copytree'):
             with pytest.raises(Exception):
                 task.run(1)
 
@@ -1944,7 +1944,7 @@ def test_job_run_no_ee(mock_me):
     task.update_model = mock.Mock(return_value=job)
     task.model.objects.get = mock.Mock(return_value=job)
 
-    with mock.patch('awx.main.tasks.jobs.copy_tree'):
+    with mock.patch('awx.main.tasks.jobs.shutil.copytree'):
         with pytest.raises(RuntimeError) as e:
             task.pre_run_hook(job, private_data_dir)