[purview] allow purview pylint failures (Azure#18237)

Author: iscai-msft

eng/tox/allowed_pylint_failures.py

@@ -51,4 +51,7 @@
     "azure-ai-anomalydetector",
     "azure-security-attestation",
     "azure-iot-deviceupdate",
+    "azure-purview-nspkg",
+    "azure-purview-scanning",
+    "azure-purview-catalog",
 ]