Fix exception when including tasks from handlers (#47307)

Set _notified_handlers for the task's _uuid that is run as a handler

Fix #47287

test/integration/targets/handlers/runme.sh

@@ -63,3 +63,6 @@ set +e
 result="$(ansible-playbook test_handlers_any_errors_fatal.yml -e output_dir=$output_dir -i inventory.handlers -v "$@" 2>&1)"
 set -e
 [ ! -f $output_dir/should_not_exist_B ] || (rm -f $output_dir/should_not_exist_B && exit 1)
+
+# https://github.com/ansible/ansible/issues/47287
+[ "$(ansible-playbook test_handlers_including_task.yml -i ../../inventory -v "$@" | egrep -o 'failed=[0-9]+')" = "failed=0" ]

test/integration/targets/handlers/test_handlers_including_task.yml

@@ -0,0 +1,16 @@
+---
+- name: Verify handler can include other tasks (#47287)
+  hosts: testhost
+  tasks:
+    - name: include a task from the tasks section
+      include_tasks: handlers.yml
+
+    - name: notify a handler
+      debug:
+        msg: notifying handler
+      changed_when: yes
+      notify: include a task from the handlers section
+
+  handlers:
+    - name: include a task from the handlers section
+      include_tasks: handlers.yml