### Summary

`ansible.template.is_template` tries to loop until it determines if the value is indeed a template.  Which means we could loop extremely large strings, that don't even remotely look like templates, before we bail.

However, we could benefit from moving `Templar.is_possibly_template` to the global scope, and testing whether the value after `jinja_env.preprocess` is even possibly a template, before doing more computationally complex validation.

### Issue Type

Feature Idea

### Component Name

lib/ansible/template/__init__.py

### Additional Information

<!--- Paste example playbooks or commands between quotes below -->
```yaml (paste below)

```


### Code of Conduct

- [X] I agree to follow the Ansible Code of Conduct
'''
    Counts the number of newlines at the end of a string. This is used during
    the jinja2 templating to ensure the count matches the input, since some newlines
    may be thrown away during the templating.
    '''
    try:
        i = len(in_str)
        j = i - 1
        while in_str[j] == '\n':
            j -= 1
        return i - 1 - j
    except IndexError:
        
        return i
def recursive_check_defined(item):