### Summary

Saw this happening with ansible 2.15.3
When using ANSIBLE_DEBUG=1 with a add_host task, the task fails with

ansible/utils/vars.py\", line 91, in combine_vars\n    result = a | b\nTypeError: unsupported operand type(s) for |: 'VarsWithSources' and 'dict'

Same bug with ANSIBLE_DEBUG enabled: https://github.com/ansible/ansible/issues/79763
Where fix is needed: https://github.com/ansible/ansible/blob/3ec0850df9429f4b1abc78d9ba505df12d7dd1db/lib/ansible/utils/vars.py#L91

### Issue Type

Bug Report

### Component Name

add_host

### Ansible Version

```console
$ ansible --version
ansible [core 2.15.3]
  config file = None
  configured module search path = ['/home/runner/.ansible/plugins/modules', '/usr/share/ansible/plugins/modules']
  ansible python module location = /usr/local/lib/python3.9/site-packages/ansible
  ansible collection location = /home/runner/.ansible/collections:/usr/share/ansible/collections
  executable location = /usr/local/bin/ansible
  python version = 3.9.17 (main, Jun 13 2023, 16:05:09) [GCC 8.3.0] (/usr/local/bin/python3)
  jinja version = 3.0.3
  libyaml = True
```


### Configuration

```console
# if using a version older than ansible-core 2.12 you should omit the '-t all'
$ ansible-config dump --only-changed -t all
ansible-config [core 2.15.3]
  config file = None
  configured module search path = ['/home/runner/.ansible/plugins/modules', '/usr/share/ansible/plugins/modules']
  ansible python module location = /usr/local/lib/python3.9/site-packages/ansible
  ansible collection location = /home/runner/.ansible/collections:/usr/share/ansible/collections
  executable location = /usr/local/bin/ansible-config
  python version = 3.9.17 (main, Jun 13 2023, 16:05:09) [GCC 8.3.0] (/usr/local/bin/python3)
  jinja version = 3.0.3
  libyaml = True
No config file found; using defaults
Loading collection ansible.builtin from
```


### OS / Environment

Debian GNU/Linux 10 (buster)
Linux 3.10.0-1127.el7.x86_64 x86_64

### Steps to Reproduce
```
- name: create inventory
  hosts: localhost
  gather_facts: no
  tasks:
    - add_host:
        name: "{{ item }}"
        groups: resource_types
      with_items:
        - node
        - pod
        - namespace
        - ResourceQuota
```
### Expected Results

successfull result of playbook

### Actual Results

```console
ansible/utils/vars.py\", line 91, in combine_vars\n    result = a | b\nTypeError: unsupported operand type(s) for |: 'VarsWithSources' and 'dict'
```


### Code of Conduct

- [X] I agree to follow the Ansible Code of Conduct
try:
                        for vars_file in vars_file_list:
                            vars_file = templar.template(vars_file)
                            if not (isinstance(vars_file, Sequence)):
                                raise AnsibleError(
                                    "Invalid vars_files entry found: %r\n"
                                    "vars_files entries should be either a string type or "
                                    "a list of string types after template expansion" % vars_file
                                )
                            try:
                                play_search_stack = play.get_search_path()
                                found_file = real_file = self._loader.path_dwim_relative_stack(play_search_stack, 'vars', vars_file)
                                data = preprocess_vars(self._loader.load_from_file(found_file, unsafe=True, cache=False))
                                if data is not None:
                                    for item in data:
                                        all_vars = _combine_and_track(all_vars, item, "play vars_files from '%s'" % vars_file)
                                break
                            except AnsibleFileNotFound:
                                
                                continue
                            except AnsibleParserError:
                                raise
                        else:
                            
                            
                            if include_delegate_to and host:
                                raise AnsibleFileNotFound("vars file %s was not found" % vars_file_item)
                    except (UndefinedError, AnsibleUndefinedVariable):
                        if host is not None and self._fact_cache.get(host.name, dict()).get('module_setup') and task is not None:
                            raise AnsibleUndefinedVariable("an undefined variable was found when attempting to template the vars_files item '%s'"