### Summary

If a galaxy requirements file contains collections that have signatures defined, then `ansible-galaxy role install` with that requirements file fails because a keyring is not supplied.

### Issue Type

Bug Report

### Component Name

ansible-galaxy

### Ansible Version

```console
$ ansible --version

ansible [core 2.13.0.dev0] (devel ff184b0815) last updated 2022/03/24 16:21:31 (GMT -400)
  config file = /home/shrews/.ansible.cfg
  configured module search path = ['/home/shrews/.ansible/plugins/modules', '/usr/share/ansible/plugins/modules']
  ansible python module location = /home/shrews/Devel/github/Shrews/ansible/lib/ansible
  ansible collection location = /home/shrews/.ansible/collections:/usr/share/ansible/collections
  executable location = /home/shrews/Devel/github/Shrews/ansible/bin/ansible
  python version = 3.9.7 (default, Sep 10 2021, 14:59:43) [GCC 11.2.0]
  jinja version = 3.1.0
  libyaml = True
```


### Configuration

```console
$ ansible-config dump --only-changed

DEFAULT_HOST_LIST(/home/shrews/.ansible.cfg) = ['/home/shrews/Devel/ansible/hosts.yaml']
```


### OS / Environment

Ubuntu 21.10

### Steps to Reproduce

<!--- Paste example playbooks or commands between quotes below -->
```yaml (paste below)

$ cat req.yml 
collections:
  - name: community.mysql
    signatures:
      - file:///home/shrews/test.asc

$ ansible-galaxy role install -r req.yml 
ERROR! Signatures were provided to verify community.mysql but no keyring was configured.
```


### Expected Results

`role install` should ignore collection signatures

### Actual Results

```console
$ ansible-galaxy role install -r req.yml -vvvv

ansible-galaxy [core 2.13.0.dev0] (devel ff184b0815) last updated 2022/03/24 16:21:31 (GMT -400)
  config file = /home/shrews/.ansible.cfg
  configured module search path = ['/home/shrews/.ansible/plugins/modules', '/usr/share/ansible/plugins/modules']
  ansible python module location = /home/shrews/Devel/github/Shrews/ansible/lib/ansible
  ansible collection location = /home/shrews/.ansible/collections:/usr/share/ansible/collections
  executable location = /home/shrews/Devel/github/Shrews/ansible/bin/ansible-galaxy
  python version = 3.9.7 (default, Sep 10 2021, 14:59:43) [GCC 11.2.0]
  jinja version = 3.1.0
  libyaml = True
Using /home/shrews/.ansible.cfg as config file
Reading requirement file at '/home/shrews/req.yml'
ERROR! Signatures were provided to verify community.mysql but no keyring was configured.
```


### Code of Conduct

- [X] I agree to follow the Ansible Code of Conduct
from ansible.utils.collection_loader import AnsibleCollectionRef
from ansible.utils.display import Display
_ALLOW_CONCRETE_POINTER_IN_SOURCE = False  
_GALAXY_YAML = b'galaxy.yml'
_MANIFEST_JSON = b'MANIFEST.json'
_SOURCE_METADATA_FILE = b'GALAXY.yml'
display = Display()
def get_validated_source_info(b_source_info_path, namespace, name, version):
    source_info_path = to_text(b_source_info_path, errors='surrogate_or_strict')
    if not os.path.isfile(b_source_info_path):
        return None
    try:
        with open(b_source_info_path, mode='rb') as fd:
            metadata = safe_load(fd)
    except OSError as e:
        display.warning(
            f"Error getting collection source information at '{source_info_path}': {to_text(e, errors='surrogate_or_strict')}"
        )
        return None
    if not isinstance(metadata, MutableMapping):
        display.warning(f"Error getting collection source information at '{source_info_path}': expected a YAML dictionary")
        return None
    schema_errors = _validate_v1_source_info_schema(namespace, name, version, metadata)
    if schema_errors:
        display.warning(f"Ignoring source metadata file at {source_info_path} due to the following errors:")
        display.warning("\n".join(schema_errors))
        display.warning("Correct the source metadata file by reinstalling the collection.")
        return None
    return metadata
def _validate_v1_source_info_schema(namespace, name, version, provided_arguments):