ENH: JsonSchemaExporter accepts do_not_create parameter.

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For #116 (closed) Insert a meaningful description for this merge request here: What is the new/changed behavior? Which bug has been fixed? Are there related issues?

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integrationtests/test_data_model.py

@@ -56,8 +56,6 @@ class DataModelTest(unittest.TestCase):
         assert len(exist) == 1
         assert exist[0].name == "TestRecord"
 
-    @pytest.mark.xfail(reason="Entities with many, long, properties: "
-                       "https://gitlab.com/linkahead/linkahead-advanced-user-tools/-/issues/55")
     def test_large_data_model(self):
         # create RT and one property
         dm = DataModel()