Revert "Don’t enforce feature flags for mixed-version testing"

This reverts commit 7175e51.

Author: dumbbell

rabbitmq.bzl

@@ -274,6 +274,18 @@ def rabbitmq_integration_suite(
         data = native.glob(["test/{}_data/**/*".format(name)]) + data,
         test_env = dict({
             "SKIP_MAKE_TEST_DIST": "true",
+            # The feature flags listed below are required. This means they must be enabled in mixed-version testing
+            # before even starting the cluster because newer nodes don't have the corresponding compatibility/migration code.
+            "RABBITMQ_FEATURE_FLAGS":
+            # required starting from 3.11.0 in rabbit:
+            "quorum_queue,implicit_default_bindings,virtual_host_metadata,maintenance_mode_status,user_limits," +
+            # required starting from 3.12.0 in rabbit:
+            "feature_flags_v2,stream_queue,classic_queue_type_delivery_support,classic_mirrored_queue_version," +
+            "stream_single_active_consumer,direct_exchange_routing_v2,listener_records_in_ets,tracking_records_in_ets," +
+            # required starting from 3.12.0 in rabbitmq_management_agent:
+            # empty_basic_get_metric, drop_unroutable_metric
+            # required starting from 4.0 in rabbit:
+            "message_containers,stream_update_config_command,stream_filtering,stream_sac_coordinator_unblock_group,restart_streams",
             "RABBITMQ_RUN": "$(location :rabbitmq-for-tests-run)",
             "RABBITMQCTL": "$TEST_SRCDIR/$TEST_WORKSPACE/{}/broker-for-tests-home/sbin/rabbitmqctl".format(package),
             "RABBITMQ_PLUGINS": "$TEST_SRCDIR/$TEST_WORKSPACE/{}/broker-for-tests-home/sbin/rabbitmq-plugins".format(package),