fix: add Cloud, Google, GCPDataplex to _CORE_ASSETS

Asset has a relationship to GCPDataplexAspectType which causes
transitive propagation into core/. Without Google and Cloud in
the seed set, GCPDataplex lands in core/ but can't resolve its
parent import.

Author: Aryamanz29

pyatlan/generator/class_generator.py

@@ -277,6 +277,10 @@ class AssetInfo:
         "ContextRepository",
         "ContextArtifact",
         "Dremio",
+        "Cloud",
+        "Google",
+        "GCPDataplex",
+        "GCPDataplexAspectType",
     }
     _IGNORE_ASSETS = {}  # type: ignore[var-annotated]