bugfixes:
- plugin loader - Move plugin loader playbook dir additions back to ``Playbook`` instead of ``PlaybookCLI``
  to solve sub directory playbook relative plugins to be located
  (https://github.com/ansible/ansible/issues/59548)

bugfixes:
- plugin loader - Restore adding plugin loader playbook dir to ``Playbook`` in
  addition to ``PlaybookCLI`` to solve sub directory playbook relative plugins
  to be located (https://github.com/ansible/ansible/issues/59548)

Fix changelog entry for playbook_dir fix
Fix changelog entry for playbook_dir fix

The final version of the fix makes the addition in two places instead of
moving the single addition from one place to another
