Ensure correct environment_class is set on Template (#77485)

changelogs/fragments/templar-correct-environment_class-template.yml

@@ -0,0 +1,2 @@
+bugfixes:
+  - Ensure the correct ``environment_class`` is set on ``AnsibleJ2Template``

lib/ansible/template/__init__.py

@@ -674,6 +674,7 @@ class Templar:
             extensions=self._get_extensions(),
             loader=FileSystemLoader(loader.get_basedir() if loader else '.'),
         )
+        self.environment.template_class.environment_class = environment_class
 
         # jinja2 global is inconsistent across versions, this normalizes them
         self.environment.globals['dict'] = dict