chore(access): Add pytest mark for Model Entity Tests

ref: #839 closes #840

Author: jon-nfc

pyproject.toml

@@ -1117,6 +1117,7 @@ markers = [
     "model_devicesoftware: Select tests for model Device Software.",
     "model_devicetype: Select all device type tests.",
     "model_employee: Selects test for model Employee.",
+    "model_entity: Selects test for model Entity.",
     "model_externallink: Select tests for model External Link.",
     "model_featureflag: Feature Flag Model",
     "model_gitgroup: Selects tests for model `git group`",