Temporarily disable BQ from testing due to hangs

Author: VaggelisD

sqlmesh/core/engine_adapter/bigquery.py

@@ -67,7 +67,6 @@ class BigQueryEngineAdapter(ClusteredByMixin, RowDiffMixin):
     MAX_TABLE_COMMENT_LENGTH = 1024
     MAX_COLUMN_COMMENT_LENGTH = 1024
     SUPPORTS_QUERY_EXECUTION_TRACKING = True
-    SUPPORTS_EXTERNAL_MODEL_FRESHNESS = True
     SUPPORTED_DROP_CASCADE_OBJECT_KINDS = ["SCHEMA"]
     INSERT_OVERWRITE_STRATEGY = InsertOverwriteStrategy.MERGE