### 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
dest:
        description:
            - The path of where the repository should be checked out. This
              is equivalent to C(git clone [repo_url] [directory]). The repository
              named in I(repo) is not appended to this path and the destination directory must be empty. This
              parameter is required, unless I(clone) is set to C(no).
        type: path
        required: true
    version:
        description:
            - What version of the repository to check out. This can be
              the literal string C(HEAD), a branch name, a tag name.
              It can also be a I(SHA-1) hash, in which case I(refspec) needs
              to be specified if the given revision is not already available.
        type: str
        default: "HEAD"
    accept_hostkey:
        description:
            - If C(yes), ensure that "-o StrictHostKeyChecking=no" is
              present as an ssh option.
        type: bool
        default: 'no'
        version_added: "1.5"
    accept_newhostkey:
        description:
            - As of OpenSSH 7.5, "-o StrictHostKeyChecking=accept-new" can be
              used which is safer and will only accepts host keys which are
              not present or are the same. if C(yes), ensure that
              "-o StrictHostKeyChecking=accept-new" is present as an ssh option.
        type: bool