Fix fallout from #70028.

test/integration/targets/collections/runme.sh

@@ -30,7 +30,7 @@ ANSIBLE_CALLBACKS_ENABLED=charlie.gomez.notme ansible localhost -m debug 2>&1 |
 
 unset ANSIBLE_LOAD_CALLBACK_PLUGINS
 # adhoc normally shouldn't load non-default plugins- let's be sure
-output=$(ANSIBLE_CALLBACK_ENABLED=testns.testcoll.usercallback ansible localhost -m debug)
+output=$(ANSIBLE_CALLBACKS_ENABLED=testns.testcoll.usercallback ansible localhost -m debug)
 if [[ "${output}" =~ "usercallback says ok" ]]; then echo fail; exit 1; fi
 
 echo "--- validating docs"

test/lib/ansible_test/_internal/executor.py

@@ -1434,7 +1434,7 @@ def integration_environment(args, target, test_dir, inventory_path, ansible_conf
 
     integration = dict(
         JUNIT_OUTPUT_DIR=ResultType.JUNIT.path,
-        ANSIBLE_CALLBACK_ENABLED=','.join(sorted(set(callback_plugins))),
+        ANSIBLE_CALLBACKS_ENABLED=','.join(sorted(set(callback_plugins))),
         ANSIBLE_TEST_CI=args.metadata.ci_provider or get_ci_provider().code,
         ANSIBLE_TEST_COVERAGE='check' if args.coverage_check else ('yes' if args.coverage else ''),
         OUTPUT_DIR=test_dir,