### 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_info = gr.install_info
    version = None
    if install_info:
        version = install_info.get("version", None)
    if not version:
        version = "(unknown version)"
    display.display("- %s, %s" % (gr.name, version))
def _display_collection(collection, cwidth=10, vwidth=7, min_cwidth=10, min_vwidth=7):
    display.display('{fqcn:{cwidth}} {version:{vwidth}}'.format(
        fqcn=to_text(collection.fqcn),
        version=collection.ver,
        cwidth=max(cwidth, min_cwidth),  
        vwidth=max(vwidth, min_vwidth)
    ))
def _get_collection_widths(collections):
    if not is_iterable(collections):
        collections = (collections, )
    fqcn_set = {to_text(c.fqcn) for c in collections}
    version_set = {to_text(c.ver) for c in collections}
    fqcn_length = len(max(fqcn_set, key=len))
    version_length = len(max(version_set, key=len))
    return fqcn_length, version_length
def validate_signature_count(value):
    match = re.match(SIGNATURE_COUNT_RE, value)
    if match is None:
        raise ValueError(f"{value} is not a valid signature count value")
    return value
@dataclass
class RoleDistributionServer: