### Summary

When running the builtin `known_hosts` module without a `path` argument (thus defaulting to `~/.ssh/known_hosts`), it will fail when `~/.ssh/` does not exist.

https://github.com/ansible/awx/issues/10984

### Issue Type

Documentation Report

### Component Name

known_hosts

### Ansible Version

```console
$ ansible --version
ansible [core 2.12.0.dev0]
  config file = None
  configured module search path = ['/home/runner/.ansible/plugins/modules', '/usr/share/ansible/plugins/modules']
  ansible python module location = /usr/local/lib/python3.8/site-packages/ansible
  ansible collection location = /home/runner/.ansible/collections:/usr/share/ansible/collections
  executable location = /usr/local/bin/ansible
  python version = 3.8.6 (default, Jan 29 2021, 17:38:16) [GCC 8.4.1 20200928 (Red Hat 8.4.1-1)]
  jinja version = 2.10.3
  libyaml = True
```


### Configuration

```console
$ ansible-config dump --only-changed
[WARNING]: You are running the development version of Ansible. You should only run Ansible from "devel" if you are modifying the Ansible engine, or trying out features under development.
This is a rapidly changing source of code and can become unstable at any point.
```


### OS / Environment

Docker image quay.io/ansible/awx-ee:latest (Image id 139d0f567124 )

### Steps to Reproduce

<!--- Paste example playbooks or commands between quotes below -->
```sh
bash-4.4$ ansible localhost -m known_hosts -a 'name=example.com key="example.com ssh-rsa test"'
```


### Expected Results

Success & the given key in a new `~/.ssh/known_hosts`

### Actual Results

```console
localhost | FAILED! => {
    "changed": false,
    "msg": "Failed to write to file /home/runner/.ssh/known_hosts: [Errno 2] No such file or directory: '/home/runner/.ssh/tmpkqkq1oke'"
}
```


### Code of Conduct

- [X] I agree to follow the Ansible Code of Conduct
'''search_for_host_key(module,host,key,path,sshkeygen) -> (found,replace_or_add,found_line)
    Looks up host and keytype in the known_hosts file path; if it's there, looks to see
    if one of those entries matches key. Returns:
    found (Boolean): is host found in path?
    replace_or_add (Boolean): is the key in path different to that supplied by user?
    found_line (int or None): the line where a key of the same type was found
    if found=False, then replace is always False.
    sshkeygen is the path to ssh-keygen, found earlier with get_bin_path
    '''
    if os.path.exists(path) is False:
        return False, False, None
    sshkeygen_command = [sshkeygen, '-F', host, '-f', path]
    
    
    rc, stdout, stderr = module.run_command(sshkeygen_command, check_rc=False)
    if stdout == '' and stderr == '' and (rc == 0 or rc == 1):
        return False, False, None  
    if rc != 0:  
        module.fail_json(msg="ssh-keygen failed (rc=%d, stdout='%s',stderr='%s')" % (rc, stdout, stderr))
    
    if not key:
        return True, False, None
    lines = stdout.split('\n')