Allow for vaulted templates in template lookup (#49819)

Fixes #34209

test/integration/targets/lookups/runme.sh

@@ -7,3 +7,5 @@ set -eux
 pip install passlib
 
 ANSIBLE_ROLES_PATH=../ ansible-playbook lookups.yml -i ../../inventory -e @../../integration_config.yml "$@"
+
+ansible-playbook template_lookup_vaulted.yml -i ../../inventory -e @../../integration_config.yml --vault-password-file test_vault_pass "$@"

test/integration/targets/lookups/template_lookup_vaulted.yml

@@ -0,0 +1,13 @@
+# https://github.com/ansible/ansible/issues/34209
+- hosts: localhost
+  gather_facts: no
+  vars:
+      hello_world: Hello World
+  tasks:
+    - name: Test that template lookup can handle vaulted templates
+      set_fact:
+        vaulted_hello_world: "{{ lookup('template', 'vaulted_hello.j2') }}"
+
+    - assert:
+        that:
+          - "vaulted_hello_world|trim == 'Unvaulted Hello World!'"

test/integration/targets/lookups/templates/vaulted_hello.j2

@@ -0,0 +1,6 @@
+$ANSIBLE_VAULT;1.1;AES256
+33623433323331343363343830343365376233386637366264646634663632343963396664393463
+3734626234626639323061643863613164643365363063310a663336663762356135396430353435
+39303930613231336135623761363130653235666433383965306235653963343166633233323638
+6635303662333734300a623063393761376531636535383164333632613839663237336463616436
+62643437623538633335366435346532636666616139386332323034336530356131

test/integration/targets/lookups/test_vault_pass

@@ -0,0 +1 @@
+test