[MAINTENANCE] Fixes Glue tests on vanilla pytest (#7925)

Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>
Co-authored-by: Gabriel Gore <gabriel59kg@gmail.com>

tests/datasource/conftest.py

@@ -73,9 +73,12 @@ def glue_titanic_catalog():
             "AWS Glue Data Catalog Data Connector tests are requested, but boto3 is not installed"
         )
 
+    os.environ[
+        "AWS_DEFAULT_REGION"
+    ] = "testing"  # required when connecting to the glue client, even when mocked
+
     with mock_glue():
-        region_name: str = "us-east-1"
-        client = boto3.client("glue", region_name=region_name)
+        client = boto3.client("glue")
         database_name = "db_test"
 
         # Create Database