fix: Set cte_follows_insert to True (#1095)

Author: aholyoke

sqlalchemy_bigquery/base.py

@@ -990,6 +990,7 @@ class BigQueryDialect(DefaultDialect):
     type_compiler = BigQueryTypeCompiler
     ddl_compiler = BigQueryDDLCompiler
     execution_ctx_cls = BigQueryExecutionContext
+    cte_follows_insert = True
     supports_alter = False
     supports_comments = True
     inline_comments = True

tests/sqlalchemy_dialect_compliance/test_dialect_compliance.py

@@ -537,10 +537,6 @@ def test_round_trip_executemany(self, connection):
 
 
 class CTETest(_CTETest):
-    @pytest.mark.skip("Can't use CTEs with insert")
-    def test_insert_from_select_round_trip(self):
-        pass
-
     @pytest.mark.skip("Recusive CTEs aren't supported.")
     def test_select_recursive_round_trip(self):
         pass