### Summary

I'm trying to optimise my builds by avoiding unnecessary downloads.
ansible-galaxy install always downloads the latest version even if the existing collection already meets the requirements. This behaviour appears to be consistent with the documentation (https://docs.ansible.com/ansible/latest/galaxy/user_guide.html#installing-an-older-version-of-a-collection), but why has it been implemented to always download ?


e.g. I have
```
# /usr/local/lib/python3.8/site-packages/ansible_collections
Collection                    Version
----------------------------- -------
amazon.aws                    3.5.0  
...
```
and requirements.yml
```
---
collections:
  - name: amazon.aws
    version: '>=1.5.0'
```
if I run ansible-galaxy install -r requirements.yml I get amazon.aws 6.1.0 installed, even though 3.5.0 already meets my 1.5.0 requirement. I would expect nothing to happen because my requirements were already met.

### Issue Type

Feature Idea

### Component Name

ansible galaxy

### Additional Information

People who like the existing behaviour could perhaps use the recently added --upgrade switch to continue to get the upgrade to the lastest version.

### Code of Conduct

- [X] I agree to follow the Ansible Code of Conduct
error_msg_lines.append(pre_release_hint)
        raise AnsibleError('\n'.join(error_msg_lines)) from dep_exc
    except CollectionDependencyInconsistentCandidate as dep_exc:
        parents = [
            "%s.%s:%s" % (p.namespace, p.name, p.ver)
            for p in dep_exc.criterion.iter_parent()
            if p is not None
        ]
        error_msg_lines = [
            (
                'Failed to resolve the requested dependencies map. '
                'Got the candidate {req.fqcn!s}:{req.ver!s} ({dep_origin!s}) '
                'which didn\'t satisfy all of the following requirements:'.
                format(
                    req=dep_exc.candidate,
                    dep_origin='direct request'
                    if not parents else 'dependency of {parent!s}'.
                    format(parent=', '.join(parents))
                )
            )
        ]
        for req in dep_exc.criterion.iter_requirement():
            error_msg_lines.append(
                '* {req.fqcn!s}:{req.ver!s}'.format(req=req)
            )
        error_msg_lines.append(pre_release_hint)
        raise AnsibleError('\n'.join(error_msg_lines)) from dep_exc
    except ValueError as exc:
        raise AnsibleError(to_native(exc)) from exc