### Summary

To reproduce, run these commands where `ns.col` is the name of a collection you do not have installed and the value of `-p` is a valid collection path that exists:

`ansible-galaxy collection list ns.col -p collections/`
`$?`

The output of $? on devel is 0, but since the collection wasn't found it should be 1. The same issue exists for listing specific roles that do not exist.

To fix:
1. [This method](https://github.com/ansible/ansible/blob/stable-2.14/lib/ansible/cli/galaxy.py#L1494-L1502) needs to return the correct exit code from `execute_list_role` and `execute_list_collection`.

2. `execute_list_collection` and `execute_list_role` will need to be fixed to return 1 if a collection/role was requested and not found.
For example, on [this line ](https://github.com/ansible/ansible/blob/stable-2.14/lib/ansible/cli/galaxy.py#L1680) add
```python
        if not collection_found and collection_name:
            return 1
```

3. Add a new test to [this file](https://github.com/ansible/ansible/blob/stable-2.14/test/integration/targets/ansible-galaxy-collection/tasks/list.yml), similar to [this one](https://github.com/ansible/ansible/blob/stable-2.14/test/integration/targets/ansible-galaxy-collection/tasks/list.yml#L111-L116) that lists a single collection that does not exist. Then add an assert task following it to test that the command result's rc is 1.

4. Add a `bugfixes` [changelog fragment](https://docs.ansible.com/ansible/latest/community/development_process.html#creating-a-changelog-fragment).

### Issue Type

Bug Report

### Component Name

ansible-galaxy

### Ansible Version

```console
$ ansible --version
ansible [core 2.15.0.dev0]
```


### 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
```


### OS / Environment

N/A

### Steps to Reproduce

<!--- Paste example playbooks or commands between quotes below -->
```bash (paste below)
ansible-galaxy collection list ns.col -p collections/
$?
```

### Expected Results

1

### Actual Results

```console
0
```


### Code of Conduct

- [X] I agree to follow the Ansible Code of Conduct
install_parser.add_argument('--ignore-signature-status-code', dest='ignore_gpg_errors', type=str, action='append',
                                        help=ignore_gpg_status_help, default=C.GALAXY_IGNORE_INVALID_SIGNATURE_STATUS_CODES,
                                        choices=list(GPG_ERROR_MAP.keys()))
            install_parser.add_argument('--offline', dest='offline', action='store_true', default=False,
                                        help='Install collection artifacts (tarballs) without contacting any distribution servers. '
                                             'This does not apply to collections in remote Git repositories or URLs to remote tarballs.'
                                        )
        else:
            install_parser.add_argument('-r', '--role-file', dest='requirements',
                                        help='A file containing a list of roles to be installed.')
            r_re = re.compile(r'^(?<!-)-[a-zA-Z]*r[a-zA-Z]*')  
            contains_r = bool([a for a in self._raw_args if r_re.match(a)])
            role_file_re = re.compile(r'--role-file($|=)')  
            contains_role_file = bool([a for a in self._raw_args if role_file_re.match(a)])
            if self._implicit_role and (contains_r or contains_role_file):
                
                install_parser.add_argument('--keyring', dest='keyring', default=C.GALAXY_GPG_KEYRING,
                                            help='The keyring used during collection signature verification')
                install_parser.add_argument('--disable-gpg-verify', dest='disable_gpg_verify', action='store_true',
                                            default=C.GALAXY_DISABLE_GPG_VERIFY,
                                            help='Disable GPG signature verification when installing collections from a Galaxy server')
                install_parser.add_argument('--required-valid-signature-count', dest='required_valid_signature_count', type=validate_signature_count,
                                            help=valid_signature_count_help, default=C.GALAXY_REQUIRED_VALID_SIGNATURE_COUNT)
                install_parser.add_argument('--ignore-signature-status-code', dest='ignore_gpg_errors', type=str, action='append',
                                            help=ignore_gpg_status_help, default=C.GALAXY_IGNORE_INVALID_SIGNATURE_STATUS_CODES,
                                            choices=list(GPG_ERROR_MAP.keys()))
            install_parser.add_argument('-g', '--keep-scm-meta', dest='keep_scm_meta', action='store_true',
                                        default=False,
                                        help='Use tar instead of the scm archive option when packaging the role.')
    def add_build_options(self, parser, parents=None):