### Summary

See: https://github.com/ansible/ansible/blob/devel/lib/ansible/modules/git.py#L760 :

```py
            repo_path = os.path.join(repo_path.split('.git')[0], gitdir)
```

the intention of this code seems to be to strip `.git` from the end of the path.

If the repo path contains `.git` anywhere, like `/tmp/music.gittern/myrepo`, tasks will unexpectedly fail:

```
fatal: [localhost]: FAILED! => {"changed": false, "details": "/tmp/music/../.git/modules/submodule is not a directory", "msg": "Current repo does not have a valid reference to a separate Git dir or it refers to the invalid path"}
```

For a playbook like:
```yaml
---
- hosts: localhost
  tasks:
   - name: test git
     git: 
        repo: ...
        dest: /tmp/music.gittern/myrepo/submodule
```

I can't tell if this is a potential security issue or just an unexpected corner case. What I am pretty sure I can tell, is that that's not how one strips `.git` from the end of a path.

### Issue Type

Bug Report

### Component Name

git

### Ansible Version

```console
$ ansible --version
2.11
```


### Configuration

```console
$ ansible-config dump --only-changed
ANSIBLE_NOCOWS(/home/enrico/dev/transilience/ansible.cfg) = True
```


### OS / Environment

Debian Bullseye

### Steps to Reproduce

Use submodules in a repo whose path contains `.git` anywhere as part of a file name.
For example:
```yaml
---
- hosts: localhost
  tasks:
   - name: test git
     git: 
        repo: ...
        dest: /tmp/music.gittern/myrepo/submodule
```

### Expected Results

I'd expect directory names like `gato.gito` not to be interpreted specially by mistake

### Actual Results

```console
fatal: [localhost]: FAILED! => {"changed": false, "details": "/tmp/music/../.git/modules/submodule is not a directory", "msg": "Current repo does not have a valid reference to a separate Git dir or it refers to the invalid path"}
```


### Code of Conduct

- [X] I agree to follow the Ansible Code of Conduct
cmd = [git_path, 'clone']
    if bare:
        cmd.append('--bare')
    else:
        cmd.extend(['--origin', remote])
    is_branch_or_tag = is_remote_branch(git_path, module, dest, repo, version) or is_remote_tag(git_path, module, dest, repo, version)
    if depth:
        if version == 'HEAD' or refspec:
            cmd.extend(['--depth', str(depth)])
        elif is_branch_or_tag:
            cmd.extend(['--depth', str(depth)])
            cmd.extend(['--branch', version])
        else:
            
            module.warn("Ignoring depth argument. "
                        "Shallow clones are only available for "
                        "HEAD, branches, tags or in combination with refspec.")
    if reference:
        cmd.extend(['--reference', str(reference)])
    if single_branch:
        if git_version_used is None:
            module.fail_json(msg='Cannot find git executable at %s' % git_path)
        if git_version_used < LooseVersion('1.7.10'):
            module.warn("git version '%s' is too old to use 'single-branch'. Ignoring." % git_version_used)
        else:
            cmd.append("--single-branch")
            if is_branch_or_tag:
                cmd.extend(['--branch', version])
    needs_separate_git_dir_fallback = False
    if separate_git_dir: