import_tasks: Raise an error when applying notify

notify is not valid import_tasks attribute. Raise an error
when user specifies it.

Fixes: ansible#64935

Signed-off-by: Abhijeet Kasurde <akasurde@redhat.com>

changelogs/fragments/64935_import_tasks.yml

@@ -0,0 +1,2 @@
+bugfixes:
+- Raise an error when including notify in import tasks (https://github.com/ansible/ansible/issues/64935).

lib/ansible/playbook/task_include.py

@@ -85,7 +85,7 @@ def preprocess_data(self, ds):
         diff = set(ds.keys()).difference(self.VALID_INCLUDE_KEYWORDS)
         for k in diff:
             # This check doesn't handle ``include`` as we have no idea at this point if it is static or not
-            if ds[k] is not Sentinel and ds['action'] in ('include_tasks', 'include_role'):
+            if ds[k] is not Sentinel and ds['action'] in ('include_tasks', 'include_role', 'import_tasks'):
                 if C.INVALID_TASK_ATTRIBUTE_FAILED:
                     raise AnsibleParserError("'%s' is not a valid attribute for a %s" % (k, self.__class__.__name__), obj=ds)
                 else: