Enable transaction context manager test for psycopg instrumentation

The conn.transaction() context manager now works correctly thanks to
the lazy capture mechanism that defers fetchall() until fetch is called.

Author: sohankshirsagar

drift/instrumentation/psycopg/e2e-tests/src/test_requests.py

@@ -72,8 +72,10 @@
     # Test: NULL values handling (integrated into E2E suite)
     make_request("GET", "/test/null-values")
 
+    # Test: Transaction context manager
+    make_request("GET", "/test/transaction-context")
+
     # These still need investigation:
-    # make_request("GET", "/test/transaction-context")
     # make_request("GET", "/test/json-jsonb")
     # make_request("GET", "/test/array-types")