Add connection retries to ParadeDB test helper

PostgreSQL may not be ready to accept queries immediately after the TCP
port becomes reachable (Docker port forwarding opens the port before
PostgreSQL finishes initialization). Retry the connection to handle this
timing window.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: whummer

paradedb/tests/test_extension.py

@@ -1,6 +1,7 @@
 import boto3
 import psycopg2
 from localstack.utils.strings import short_uid
+from localstack.utils.sync import retry
 
 
 # Connection details for ParadeDB
@@ -13,14 +14,16 @@
 
 
 def get_connection():
-    """Create a connection to ParadeDB."""
-    return psycopg2.connect(
-        host=HOST,
-        port=PORT,
-        user=USER,
-        password=PASSWORD,
-        database=DATABASE,
-    )
+    """Create a connection to ParadeDB, retrying until the server is ready."""
+    def _connect():
+        return psycopg2.connect(
+            host=HOST,
+            port=PORT,
+            user=USER,
+            password=PASSWORD,
+            database=DATABASE,
+        )
+    return retry(_connect, retries=15, sleep=2.0)
 
 
 def test_connect_to_paradedb():