debug: hide loop variables while using var (#84597)

Fixes: #65856

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

changelogs/fragments/hide-loop-vars-debug-vars.yml

@@ -0,0 +1,3 @@
+---
+bugfixes:
+  - debug - hide loop vars in debug var display (https://github.com/ansible/ansible/issues/65856).

lib/ansible/plugins/callback/__init__.py

@@ -163,7 +163,10 @@ class CallbackBase(AnsiblePlugin):
         if options is not None:
             self.set_options(options)
 
-        self._hide_in_debug = ('changed', 'failed', 'skipped', 'invocation', 'skip_reason')
+        self._hide_in_debug = (
+            'changed', 'failed', 'skipped', 'invocation', 'skip_reason',
+            'ansible_loop_var', 'ansible_index_var', 'ansible_loop',
+        )
 
     # helper for callbacks, so they don't all have to include deepcopy
     _copy_result = deepcopy

test/integration/targets/callback_default/callback_default.out.result_format_yaml_lossy_verbose.stdout

@@ -120,7 +120,6 @@ failed: [testhost] (item=debug-2) =>
 ok: [testhost] => (item=debug-3) => 
     msg: debug-3
 skipping: [testhost] => (item=debug-4)  => 
-    ansible_loop_var: item
     false_condition: item != 4
     item: 4
 fatal: [testhost]: FAILED! => 
@@ -200,11 +199,9 @@ skipping: [testhost] =>
 
 TASK [debug] *******************************************************************
 skipping: [testhost] => (item=1)  => 
-    ansible_loop_var: item
     false_condition: false
     item: 1
 skipping: [testhost] => (item=2)  => 
-    ansible_loop_var: item
     false_condition: false
     item: 2
 skipping: [testhost] => 

test/integration/targets/callback_default/callback_default.out.result_format_yaml_verbose.stdout

@@ -126,7 +126,6 @@ failed: [testhost] (item=debug-2) =>
 ok: [testhost] => (item=debug-3) => 
     msg: debug-3
 skipping: [testhost] => (item=debug-4)  => 
-    ansible_loop_var: item
     false_condition: item != 4
     item: 4
 fatal: [testhost]: FAILED! => 
@@ -207,11 +206,9 @@ skipping: [testhost] =>
 
 TASK [debug] *******************************************************************
 skipping: [testhost] => (item=1)  => 
-    ansible_loop_var: item
     false_condition: false
     item: 1
 skipping: [testhost] => (item=2)  => 
-    ansible_loop_var: item
     false_condition: false
     item: 2
 skipping: [testhost] =>