Initial (editable) pass of adding JT.organization

This is the old version of this feature from 2019
  this allows setting the organization in the data sent
  to the API when creating a JT, and exposes the field
  in the UI as well

Subsequent commit changes the field from editable
  to read-only, but as of this commit, the machinery
  is not hooked up to infer it from project

awx/main/tests/unit/api/serializers/test_job_template_serializers.py

@@ -30,6 +30,7 @@ def job_template(mocker):
     mock_jt.host_config_key = '9283920492'
     mock_jt.validation_errors = mock_JT_resource_data
     mock_jt.webhook_service = ''
+    mock_jt.organization_id = None
     return mock_jt