feat(ingest/superset): initial support for superset datasets (datahub-project#11972)

Author: hwmarkcheng

metadata-ingestion/src/datahub/ingestion/source/preset.py

@@ -85,6 +85,7 @@ def __init__(self, ctx: PipelineContext, config: PresetConfig):
         super().__init__(ctx, config)
         self.config = config
         self.report = StaleEntityRemovalSourceReport()
+        self.platform = "preset"
 
     def login(self):
         try: