Do not cache the loop item label so that it will update with each item (#36609)

Add integration test for #36430 (#36432)

(cherry picked from commit d1f76939e5)
(cherry picked from commit 9fced4f0a9)

lib/ansible/executor/task_executor.py

@@ -332,7 +332,7 @@ class TaskExecutor:
             res['_ansible_ignore_errors'] = task_fields.get('ignore_errors')
 
             if label is not None:
-                res['_ansible_item_label'] = templar.template(label)
+                res['_ansible_item_label'] = templar.template(label, cache=False)
 
             self._rslt_q.put(
                 TaskResult(

test/integration/targets/loops/tasks/main.yml

@@ -176,3 +176,29 @@
   with_sequence: start=0 count=3
   loop_control:
     index_var: my_idx
+
+#
+# loop_control/label
+# https://github.com/ansible/ansible/pull/36430
+#
+
+- set_fact:
+    loopthis:
+        - name: foo
+          label: foo_label
+        - name: bar
+          label: bar_label
+
+- name: check that item label is updated each iteration
+  debug:
+    msg: "{{ looped_var.name }}"
+  with_items: "{{ loopthis }}"
+  loop_control:
+    loop_var: looped_var
+    label: "looped_var {{ looped_var.label }}"
+  register: output
+
+- assert:
+    that:
+      - "output.results[0]['_ansible_item_label'] == 'looped_var foo_label'"
+      - "output.results[1]['_ansible_item_label'] == 'looped_var bar_label'"