Remove deprecated ANSIBLE_CALLBACK_WHITELIST/callback_whitelist (#78830)

Fixes #78821
Fixes #78822

changelogs/fragments/78821-78822-remove-callback_whitelist.yml

@@ -0,0 +1,3 @@
+removed_features:
+  - Remove deprecated ``ANSIBLE_CALLBACK_WHITELIST`` configuration environment variable, use ``ANSIBLE_CALLBACKS_ENABLED`` instead. (https://github.com/ansible/ansible/issues/78821)
+  - Remove deprecated ``callback_whitelist`` configuration option, use ``callbacks_enabled`` instead. (https://github.com/ansible/ansible/issues/78822)

lib/ansible/config/base.yml

@@ -549,20 +549,9 @@ CALLBACKS_ENABLED:
     - "List of enabled callbacks, not all callbacks need enabling,
       but many of those shipped with Ansible do as we don't want them activated by default."
   env:
-  - name: ANSIBLE_CALLBACK_WHITELIST
-    deprecated:
-      why: normalizing names to new standard
-      version: "2.15"
-      alternatives: 'ANSIBLE_CALLBACKS_ENABLED'
   - name: ANSIBLE_CALLBACKS_ENABLED
     version_added: '2.11'
   ini:
-  - key: callback_whitelist
-    section: defaults
-    deprecated:
-      why: normalizing names to new standard
-      version: "2.15"
-      alternatives: 'callbacks_enabled'
   - key: callbacks_enabled
     section: defaults
     version_added: '2.11'