### 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
"""Verify integrity of the locally installed collection.
    :param local_collection: Collection being checked.
    :param remote_collection: Upstream collection (optional, if None, only verify local artifact)
    :param artifacts_manager: Artifacts manager.
    :return: a collection verify result object.
    """
    result = CollectionVerifyResult(local_collection.fqcn)
    b_collection_path = to_bytes(local_collection.src, errors='surrogate_or_strict')
    display.display("Verifying '{coll!s}'.".format(coll=local_collection))
    display.display(
        u"Installed collection found at '{path!s}'".
        format(path=to_text(local_collection.src)),
    )
    modified_content = []  
    verify_local_only = remote_collection is None
    
    get_json_from_validation_source = functools.partial(_get_json_from_installed_dir, b_collection_path)
    get_hash_from_validation_source = functools.partial(_get_file_hash, b_collection_path)
    if not verify_local_only:
        
        if local_collection.ver != remote_collection.ver:
            err = (
                "{local_fqcn!s} has the version '{local_ver!s}' but "
                "is being compared to '{remote_ver!s}'".format(
                    local_fqcn=local_collection.fqcn,
                    local_ver=local_collection.ver,
                    remote_ver=remote_collection.ver,
                )
            )